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Question

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 interest the same amount of interest can be received on the same sum after 5 years?

Options:
A .  6%
B .  8%
C .  9%
D .  10%
E .  None of these
Answer: Option B
 -  

S.I = Rs. 840, R = 5%, T = 8 years.

Principle = Rs. ( 100 x 840 ) = Rs. 2100
                              5 x 8

Now, P = Rs. 2100, S.I. = Rs. 840, T = 5 years.

Rate = ( 100 x 840 )% = 8%
               2100 x 5


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