Question

find the time in which rupees 1200 will amount to rupees 1536 at 3.5%per year

Answer 1

1536-1200=336
$336 = \frac{1200 \times 3.5 \times time}{100} \\ 33600 = 4200 \times time \\ time = \frac{33600}{4200} = 8years$