Hi Mark,

Calculating a Lehman Formula in Excel is actually quite simple. Here are the steps:

1. Determine the value of the transaction or asset you are calculating the fee for.
2. Use the IF function to calculate the fee based on the value of the transaction. Here's an example formula:
   
   
   Formula:

   =IF(A1<=1000000,A1*0.05,IF(A1<=2000000,50000+(A1-1000000)*0.04,IF(A1<=3000000,90000+(A1-2000000)*0.03,IF(A1<=4000000,120000+(A1-3000000)*0.02,160000+(A1-4000000)*0.01)))) 

   In this formula, A1 is the cell containing the value of the transaction. The formula checks the value of the transaction and applies the appropriate percentage rate based on the Lehman Formula.
   
3. The result of the formula will be the Lehman Formula fee.