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Answer (Detailed Solution Below)Option 1 : 20% Formula for Simple Interest - \(SI = \frac{{P \times R \times T}}{{100}}\) Where, P = Principal R = Rate of interest T = Time period Let the required rate of interest be X. According to the question, SI must be equal to 2 × P in order to make the final sum two times the original principal amount after 5 year. \(\therefore {\rm{P}} = {\rm{}}\frac{{{\rm{P}} \times {\rm{X}} \times 5}}{{100}}\) ⇒ X = 20% ∴ Required rate of interest is of 20%. Let's discuss the concepts related to Interest and Simple Interest. Explore more from Quantitative Aptitude here. Learn now!
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At what interest rate quarterly will an investment double itself after 8 years?If you want your money to double every 8 years, you will need to earn an interest rate of 9% (72 divided by 8).
At what rate a sum doubles itself in 8 years and 4 months?So, rate of interest at which a sum doubles itself in 8 year 4 months is 12%.
At what rate of simple interest will a sum of money doubles itself in 4 years?Hence, R = 5%. Q.
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At what rate of simple interest will a sum of money double itself in 8 years?
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