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Basic : means calculation will be performed on the Base Rate for all expenses.

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Cumulative : means that the calculation will be performed on the amount calculated just before this expense.

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At Position No. : means the calculation is to be performed on the amount at the position specified.

For Example : i) Let the CST is first the Expense
Base Rate is 100
Calculation is cumulative
Default value is 10 % and Value is Subtracted().
Rate = 100*10/100=10.
then Base rate for Scheme Expense(which is next in the list) becomes =10010
= 90.
ii) Now for Scheme expense the Base Rate =90,Default value is 5% and Value again Subtracted()
Rate= 90*5/100=4.5.
then Base rate for Dist Margin = 90.04.5
= 85.5
