How much time will it take for an amount of Rs. 2000 to yield Rs. 640 as interest at 8% p.a. of SI?A5 yearsB4 yearsC6 yearsD7 yearsAnswer: B. 4 years Read Explanation: GIVEN:Principal = Rs. 2000Rate of Interest = 8%Simple Interest = Rs. 640FORMULA USED:S.I=(P×R×T)100S.I=\frac{(P\times{R}\times{T})}{100}S.I=100(P×R×T)CALCULATION:640=(2000×8T)100640=\frac{(2000\times{8}{T})}{100}640=100(2000×8T)T=64000(2000×8)T=\frac{64000}{(2000\times{8})}T=(2000×8)64000T = 4 years. Read more in App