Question

on a certain sum the compound interest for 2 years is rupees 2172 if the rates of interest for successive years are 6% and 8% per year then find the sum

Answer 1

Given : on a certain sum the compound interest for 2 years is rupees 2172  

the rates of interest for successive years are 6% and 8% per year

To Find : the sum

Solution:

Let say Sum be 100P

Rate of interest R = 6 %

Interest in 1st Year =  100P * 6 * 1 /100  = 6P

Amount after 1 year = 100P + 6P = 106P

Rate of interest = 8 %

Interest in 2nd year = 106P * 8 * 1 /100 =  8.48P

Total Interest in2 Years = 6P + 8.48P

= 14.48P

14.48P = 2172

=> P = 150

=> 100P = 15000

Sum = 15000  Rs

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Answer 2

Answer:

See the attachment and make the answer