Question

The difference between simple and compound interest on a certain sum of money for three years @ 10% pa is rs 15.50

Answer 1

1/D=10/100=1/10 : D=10
For 3 years
CI= 3D^2 +3D+1 ,SI=3D^2
Difference=3D+1=30+1=31
31=15.50
1=0.5
Sum=D^3=10^3=1000
Sum =1000*0.5=500
500 answer