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Question
At what rate per cent per annum will the simple interest on a sum of money be $2/5$ of the amount in 10 years ?
Options:
A .  6%
B .  4%
C .  6$2/3$%
D .  5$2/3$%
Answer: Option C
Answer: (c)Using Rule 1Simple Interest (S.I.)= ${\text"Principal × Rate × Time"/100$ orS.I. = ${\text"P × R × T"/100$P = ${\text"S.I." × 100}/\text"R × T"$, R = ${\text"S.I." × 100}/\text"P × T"$, T = ${\text"S.I." × 100}/\text"P × R"$ A = P + S.I. or S.I. = A - P

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