If a compound interest on a certain sum for 2 years is Rs.21. What could be the simple interest?
A. Rs.20
B. Rs.16
C. Rs.18
D. Rs.20.50
If a compound interest on a certain sum for 2 years is Rs.21. What could be the simple interest?
A. Rs.20
B. Rs.16
C. Rs.18
D. Rs.20.50