Question
In how much time, will a sum of money become double of itself at 15% per annum simple interest?
Answer: Option C Answer: (c)If the principal be x, the amount = 2xSI = xTime = ${SI × 100}/\text"Principal × Rate"$= ${x × 100}/{x × 15} = 20/3 = 6{2}/3$ yearsUsing Rule 3,T = ${(n - 1)}/R × 100%$= $({2 - 1}/15) × 100$= $100/15 = 20/3$ Years= 6$2/3$ years
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