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#1




How do I calculate prorata formulas?
I have a spreadsheet that I need to complete for a class assignment. I am
new to Excel and would appreciate any help. It consists of 4 columns. Columns look like this: beginning budgeted amount, pay raise, improvements, ending budgets. I have the beginning budgets for each program and the pay raise and improvements dollar amount. How do I prorate the pay raise and improvements to each program. 
#2




How do I calculate prorata formulas?
"dukes" wrote:
I have a spreadsheet that I need to complete for a class assignment. I am new to Excel and would appreciate any help. It consists of 4 columns. Columns look like this: beginning budgeted amount, pay raise, improvements, ending budgets. I have the beginning budgets for each program and the pay raise and improvements dollar amount. How do I prorate the pay raise and improvements to each program. I think some key pieces of information is missing: what period of time the budget covers, how far into that period the improvements are effective, and what period of time does the pay raises and other improvements cover (e.g, monthly, annual, or for the remaining duration of the budget). For example, if this is a 12month budget and the improvements are effective starting in the 8th month, then the ending budget is: (beginning budget) + (pay raises + other improvements)*(12  8 + 1) That assumes that the improvements are recorded as monthly changes. If they are annual changes, then alter the formula above to: (...) + (... + ...)*(...)/12 In Excelspeak, assume that the budget period (in months) is in A1, the effective month of improvements is in A2, and for one program, the beginning budget is in A3, the annual pay raise is in B3, and the other annual improvements is in C3. Then the second formula for the ending budget is: =A3 + (B3 + C3)*($A$1  $A$2 + 1)/12 If the pay raises and other improvements are recorded for just the remaining period of the budget, then the formula for the ending budget becomes quite trivial, namely: =A3 + B3 + C3 No proration is required. Hope that helps. And I hope that's right(!). If you have any doubts, a concrete example with expected results is always best. 
#3




How do I calculate prorata formulas?
This is what the spreadsheet looks like. The payraise totals are $129,625.
The improvements totals are $425,866. How do I prorate these amounts to the various providers and what would the formulas look like? CONTRACTORS Beginning Budget PayRaise Improvements Ending Budget Creative 166,635 GHL 1,029,902 Haralson 95,971 Lookout Mounta 1,731,389 Three Rivers 1,432,702 TOTALS 4,456,599 Thank you so much for your help! 
#4




How do I calculate prorata formulas?
"dukes" wrote:
The payraise totals are $129,625. The improvements totals are $425,866. How do I prorate these amounts to the various providers and what would the formulas look like? Thanks for the example. I totally misunderstood your question. Looking back, I see I simply misread, not giving enough weight the very last sentence of your original posting. CONTRACTORS Beginning Budget PayRaise Improvements Ending Budget Creative 166,635 GHL 1,029,902 Haralson 95,971 Lookout Mounta 1,731,389 Three Rivers 1,432,702 TOTALS 4,456,599 First, I am surprised that you want to allocate the pay raises and improvements proportionately. But it is just a class exercise. It does not have to make realworld sense. Assume the columns above are A (contractors), B, C, D and E (ending budget). Assume that Creative is row 4. TOTALS is row 9. The total beginning budget is B9. Suppose you put the total pay raise into B1, and the total (other) improvements into B2, leaving room for appropriate titles in A1 and A2. The ending budget (E4) is simply =B4+C4+D4. Copy down. The prorated pay raise (C4) is =ROUND($B$1*B4/$B$9,0). Copy down. Similarly, the prorated improvements (D4) is =ROUND($B$2*B4/$B$9,0). Copy down. Explanation: Each prorated amount is the total amount (pay raise or improvement) times the fraction of the total beginning budget for each contractor. I assume that B9 (total beginning budget) is =SUM(B4:B8). Copy that into C9 and D9 creating =SUM(C4:C8) and =SUM(D48) respectively, rather than use the proration formula. There is nothing wrong with using the proration formula. But the SUM() formulas will provide a useful check. Note that I rounded each prorated value. That will probably cause a small error in the sums for C4:C8 and D48. To avoid the error, it would be ideal if C8 and D8 were =$B$1SUM(C4:C7) and =$B$2SUM(D47) respectively. Explanation: The last contractor gets the remainder of the total amount (pay raise or improvement) minus the sum of the other other contractors' prorated amounts. It should be a small error for the last contractor. Hope that helps. Be sure that you understand the concepts. I did not test these formulas. I might have made some typing errors. I might also note that there is plenty of room for improvements; naming B1 and B2, for example. 
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