Question

please answer this question....

Answer 1

Solution:-

$441 = 400 {(1 + \frac{r}{100} )}^{2} \\ \frac{441}{400} = {(1 + \frac{r}{100} )}^{2} \\ \frac{21}{20} = 1 + \frac{r}{100} \\ \frac{r}{100} = \frac{1}{20} \\ r = 5\% \\ new \: rate \\ 5 + 5 = 10\% \\ amount = 400 {(1 + \frac{10}{100} )}^{2} \\ amount = 400{( \frac{11}{10}) }^{2} \\ \frac{400 \times 121}{100} \\ 4\times 121 \\ amount = 484ans$