b) The rate of interest is 5% p.a.
The principal amount, P = Rs. 7500
Rate of Interest, R = 5 % p.a.
Time, T = 3 years
S.I.=P×R×T100
S.I.=7500×5×3100
S.I.=Rs 1125
Amount = Principal + Interest
⇒ Amount = 7500 + 1125
Amount = Rs 8625
Hence, the total amount to be paid at the end of three years is Rs 8625