Answer : Option A
Explanation :
This means that, simple Interest on Rs.400 for 1 year = 420 - 400 = 20
$MF#%\text{Rate = }\dfrac{100 \times \text{SI}}{\text{PT}} = \dfrac{100 \times 20}{400 \times 1}= 5\%$MF#%
Rs.400 is the interest on the sum for 1st year
$MF#%\text{Hence, sum = }\dfrac{100 \times \text{SI}}{\text{RT}}= \dfrac{100 \times 400}{5 \times 1} = \text{Rs. 8000}$MF#%
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