A. 12 2\3% B. 11 3\5% C. 11 2\3% D. 12 3\5% Let 100 was the Sum. Amount = 400. Interest = 300. R = 5%. Time = T (Let). Interest = PTR/100 = (100
*T *5)/100. 500T /100 = 300 5T = 300 T = 60 years. Now for second case, Let rate = r. Time = 60 years. Amount = 800. Interest = 700. Now, I = PTr/100 700 = 100*60 *r/100 60r = 700 r = 70/6 = 11.66%. Join The DiscussionRelated User Ask Questions Home A sum of money becomes 8 / 5 of itself in 5 years at a certain rate of simple interest .find the rate of interest. Open in App Solution Given: Time, T=5 yearsLet the principal be P (adsbygoogle = window.adsbygoogle || []).push({}); Rate of interest =R Amount, A=8P5Simple Interest, S.I= Amount − Principal =8P5−P=3P5 ∴S.I=3P5 Again, S.I=P×R×T100⇒3P5=P×R×5100⇒35=5R100⇒35=R20⇒R=3×205⇒R=3×4∴R=12. The required rate of interest is 12%. (adsbygoogle = window.adsbygoogle || []).push({});Suggest Corrections 25 Similar questions Q. A sum of money becomes 6 times of itself in 8 years. Find the rate of Simple Interest. How long will it take for an amount to become 5 times of itself at 5% per annum simple interest?Thus, it will take 8 years.
In what time the simple interest will be 5 times of sum of money invested at 20% per annum?Let the sum of money be P. Now, Let the time period be t. ∴ The time is 25 years.
What should be interest Rate for an amount to become 5 times of itself at simple interest in 50 years?Rate=P×T100×SI=15100×4x=15400=26.
At what Rate of simple interest will a sum of money becomes 5 times of itself in 12 years?100 becomes 500; Rate=TimeInterest=12400=33. 3%
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