Hi, kidd. You are describing an arithmetic series in the form of
n*(n+1)*100. So if the value n is in cell A1, then the formula in C1 would
be =A1*(A1+1)*100.

"kidd" wrote:


I am trying to make a formula that adds the amount at 200 and then the
amount if it double and triples without a limit.

Example: 1=200 /2 = 200+400/ 3 = 200+400+600/ 4 = 200+400+600+800 / 5
= 200+400+600+800+1000/ 6 = 200+400+600+800+1000+1200

If they enter in A1 the number 4

then in C1 then answer should be 2000

If they enter in A1 the number 6
then in C1 the answer should be 4200

Can anyone HELP ME PLEASE


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kidd
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