# The compound interest earned in the third and the fourth years on a certain sum of money are Rs.576 and Rs.691.2. Find the sum. Option 1) Rs.1400Option 2) Rs.1200 Option 3) Rs.1600 Option 4) Rs.2000 Option 5) Rs.1000

Difference in 4th year interest and 3rd year interest $= 115.2$

Rate =  $\frac{115.2}{576}\times 100= 20\: ^{0}/_{0}$

$A2 = 576 \times \frac{100}{120} = 480$

$A1 =480 \times \frac{100}{120} = 400$

$P = \frac{400}{20}\times 100 = 2000$

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