Question
A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years.
Answer: Option D
Answer: (d)Case I,Interest = PrincipalRate = ${Interest × 100}/\text"Principal × Time"$= $100/7%$ per annumCase II,Interest = 3 × PrincipalTime = ${Interest × 100}/\text"Principal × Time"$= ${3 × 100}/{100/7}$ = 3 × 7 = 21 years
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Answer: (d)Case I,Interest = PrincipalRate = ${Interest × 100}/\text"Principal × Time"$= $100/7%$ per annumCase II,Interest = 3 × PrincipalTime = ${Interest × 100}/\text"Principal × Time"$= ${3 × 100}/{100/7}$ = 3 × 7 = 21 years
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