Find the compound interest earned on ( a ) . $ 500 for 2 months at 11.25 % compounded monthly ( b ) . $ 100 for 6 years at 9 % compounded semiannually ( c ) . $ 850 for 3 years at 8.20 % compounded continuously ( d ) . $ 10,000 for 1 year at 10.7 % compounded daily ( e ) . $ 220 for 18 months at 18.50 % compounded quarterly