The simple interest on a certain sum of money at the rate of 5% p.a. for 8 years is Rs. 840. At what rate of intrest the same amount of interest can be received on the same sum after 5 years.	Choose the correct choice from the following answers
A) 5% B) 6% C) 7% D) 8% E) 9%
Explanation:   Here firstly we need to calculate the principal amount, then we can calculate the new rate.   P=S.I.∗100 /R∗T   P=840∗100/5∗8   P=2100   Required Rate = 840∗100/5∗2100R=8%   Option 8%
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The simple interest on a certain sum of money at the rate of 5% p.a. for 8 years is Rs. 840. At what rate of intrest the same amount of interest can be received on the same sum after 5 years.