Question
In what time will the simple interest be $2/5$ of the principal at 8 per cent per annum?
Answer: Option D
Answer: (d)Let the principal be xInterest = $2/5$ xRate = 8% per annumTime = ${\text"Interest" × 100}/\text"Principal × Rate"$=${{2/5}x × 100}/{x × 8} = 40/8$ = 5 years 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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Answer: (d)Let the principal be xInterest = $2/5$ xRate = 8% per annumTime = ${\text"Interest" × 100}/\text"Principal × Rate"$=${{2/5}x × 100}/{x × 8} = 40/8$ = 5 years 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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