Just make a small change in Hemanth's formula. Since you want the amount to be Rs.780/- if basic is above 6500/-, replace the zero in the formula with 780/- and check.
The IF STATEMENT will check the basic amount - if it is less than or equal to 6500/- then it will produce 12% of it in the cell where the formula is keyed in. Otherwise, (i.e. when basic is above Rs.6500/-) it will simply fetch 780/-
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