Question

How do ido this？ i find it looks simple but

Answer 1

So first year he has 6200 in his account and gets 2.5% which is
6200...100
X...........102.5

$x = \frac{102.5 \times 6200}{100}$
Which makes x=6355

Next year he gets 2.5% of 6355

So in 2 years he has
$x = \frac{102.5 \times 6355}{100}$
Which makes it 6.513,875

And the last year (with the same formula) he will have

6.676,721875 In his bank account