Correct Answer: Show Description for Correct answer: \( \Large P \left(1 + \frac{R}{100}\right)^{5} = 2P \) = \( \Large \left(1 + \frac{R}{100}\right)^{5} = 2 \) Let \( \Large P \left(1 + \frac{R}{100}\right)^{n} = 8P \) \( \Large \left(1 + \frac{R}{100}\right)^{n} = 8 = 2^{3} \) Fropm equation (i) \( \Large \left(1+\frac{R}{100}\right)^{n} = { \left(1+\frac{R}{100}\right)^{5} }^{3} = \left(1+\frac{R}{100}\right)^{15} \) Therefore, n = 15 years Part of solved Simple and compound interest questions and answers : >> Aptitude >> Simple and compound interest Question: A certain sum of money doubles itself in 5 years at simple interest. In how many years it becomes seven times?
Answer: Let P be the principal When it doubles in 5 years then SI=P SI=P*R*T/100 P=P*R*5/100 R=20% When it becomes 7 times the SI=6P 6P=P*20*T/100 T=30 years
Answer: An amount doubles itself in 5 years, It means that the becomes equal to the principal. i.e P + P = 2P Here the rate shall be same for both the cases. Let Principal = P, Time = 5 years and Rate = x % P = (P * 5 * x)/100 x = 20% Now, for it to become 7 times Interest needs to be 6P 6P = (P * 20 * T) / 100 T = 30 Years
Answer: Let the sum be x Simple interest on x for 5 years = x SI=P*R*T /100 x= (xR×5) /100 R=100/ 5 R=20 7x = (x* n* 20)/100 n=70/2 n=35 Post Answer and Earn Credit PointsGet 5 credit points for each correct answer. The best one gets 25 in all.
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648153514 900 1.4 K 2:19 A sum of money doubles itself in 10 yr. In how many years would it triple itself? 647491189 0 3.5 K 1:05 Harsha is 40 yr old and Rith is 60 yr old. How many years ago was the ratio of their ages `3 : 5`? Show More Comments Add a public comment... Follow Us: Popular Chapters by Class: Class 6 AlgebraBasic Geometrical IdeasData HandlingDecimalsFractions Class 7 Algebraic ExpressionsComparing QuantitiesCongruence of TrianglesData HandlingExponents and Powers Class 8 Algebraic Expressions and IdentitiesComparing QuantitiesCubes and Cube RootsData HandlingDirect and Inverse Proportions Class 9 Areas of Parallelograms and TrianglesCirclesCoordinate GeometryHerons FormulaIntroduction to Euclids Geometry Class 10 Areas Related to CirclesArithmetic ProgressionsCirclesCoordinate GeometryIntroduction to Trigonometry Class 11 Binomial TheoremComplex Numbers and Quadratic EquationsConic SectionsIntroduction to Three Dimensional GeometryLimits and Derivatives Class 12 Application of DerivativesApplication of IntegralsContinuity and DifferentiabilityDeterminantsDifferential Equations Privacy PolicyTerms And Conditions Disclosure PolicyContact Us At what rate will a sum of money doubles itself in 5 years?Detailed Solution
If a sum doubles itself in 5 years by simple interest. Calculations: Let P be the principal amount and R be the rate of interest. ∴ The rate of simple interest p.a. is 20%.
At what rate a sum doubles itself in 8 years?According to Simple Interest (S.I) formula. . Where P is principal amount, R is rate of interest and T will be time period. Hence, the rate of interest to double a money in 8 years will be 12.5% per annum.
At what sum doubles itself in 8 years 4 months?So, rate of interest at which a sum doubles itself in 8 year 4 months is 12%.
How many years will a sum of money double itself?Given: the sum of money doubles itself. ∴ Time taken is 10 years.
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If a sum of money doubles itself in 5 years in how many years does it becomes 8 times the original
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