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kamlesh kumar

· started a discussion

· 1 Months ago

Data is not given in the question... (Question: 107627.0 )

Second line in the solution "Hence Rs. 36 will be the interest on Rs. 360" is not having any mention in the question, please provide the exact solution and specify where this data come from.

Question:

The compound interest on a certain sum for 2 years is Rs.756 and SI (simple interest) is Rs.720. If the sum is invested such that the SI is Rs.900 and the number of years is equal to the rate percent per annum, find the rate percent.

Options:
A) 4
B) 5
C) 6
D) 10
Solution:
Ans: (b) Difference of C.I. for 2 years = 36

Hence Rs. 36 will be the interest on Rs. 360, then

\(\cfrac{36\times100}{360} = R \Rightarrow R\) = 10%

\(\therefore\) P = 3600

now, 

if r = t , SI = 900

then,

900 = \(\cfrac{3600\times r\times\ r }{100}\)

 

\(\Rightarrow\) r2 = 25


\(\Rightarrow\) r = 5%

Knowledge Expert

· commented

· 1 Months ago

its clearly given that the number of years is equal to the rate percent per annum
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