Question

7) One shopkeeper gives 15% commission on first rupees sell to
seller and also gives 20% commission on next sell. If seller gets
read as
total 125 rupees commission then how many rupees total sell
does the shopkeeper ?

1) 725 2) 750 3) 780 4) 800
​

Answer 1

my answer is 725 i dont no how to explain this but the answer is 725