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Sanket Mitra

· started a discussion

· 1 Months ago

Unclear question (Question: 107627.0 )

Question is unclear

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%

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