how to give conditon or formula for the following data:
if base <= 2000 calculate base * 0.08
if base >2000 and base <= 3500 calculate base * 0.11
else base >3500 calculate base* 0.15

condition: base <=2000
formula: base * 0.08
condition: base >2000 and base <= 3500
formula: base * 0.11
condition: base >3500
formula: base * 0.15

how can i make codition in only one salary structure