Question

# A sum of money invested at compounded interest amounts to Rs. $$800$$ in $$3$$ years and to Rs. $$840$$ in $$4$$ years. The rate on interest per annum is

A
3%
B
4%
C
5%
D
6%

Solution

## The correct option is C $$5\%$$Given, principal $$=$$ Rs. $$800$$S.I on Rs. $$800$$ for $$1$$ year $$=40$$$$\therefore$$ rate $$=\dfrac{100 \times 40}{80}=5\%$$Therefore, the rate of interest per annum is $$5\%$$.Mathematics

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