Simple interest on a certain sum at a certain annual rate of interest is $16/25$ of the sum. If the number representing rate per cent and time in years be equal, then the rate of interest is
Options:
A . 11$1/2$%
B . 8%
C . 12$1/4$%
D . 12$1/2$%
Answer: Option B Answer: (b)Let the rate of interest be r% and principal be P.According to the question.${16P}/25 = {P × r × r}/100$[Since, r = t numerically]$r^2 = 1600/25$r = $40/5$ = 8 % Using Rule 5If Simple Interest (S.I.) becomes 'n' times of principal i.e.S.I. = P × n then.RT = n × 100
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