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  4. Rs. 1150 become Rs. 1437.5 at 12 % per annum simple interest. The time will be.

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Q. Rs. 1150 become Rs. 1437.5 at $12 \%$ per annum simple interest. The time will be.____

Simple Interest and Compound Interest

Solution:

Here, $\mathrm{P}=$ Rs. $1150 ; \mathrm{A}=$ Rs. 1437.5; R $12 \%$ p.a. S.I $=\mathrm{A}-\mathrm{P}=\mathrm{Rs} .(1437.5-1150)=$ Rs. 287.5
Let the time be ' $\mathrm{T}$ ' years
Then, $\mathrm{T}=\frac{100 \times \mathrm{SI}}{\mathrm{P} \times \mathrm{R}}=\frac{100 \times 287.5}{1150 \times 12}=2.08 \%$