Binod buys one bag for ₹300 and sells it for ₹320. How much he earns if he sells 10 bags?

The correct option is C ₹200
Buying price of 1 bag $=₹300$
Buying price of 10 bags $=10\times$ Buying of 1 bag
$=10\times 300=₹3000$

Sellling price of 1 bags $=₹320$
Selling price of 10 bags $=10\times$Selling price of 1 bag
$=10\times 320=3200$

Money earned $=$ Selling price of 10 bags $-$ Buying price of 10 bags
$=3200-3000=₹200$

$\therefore$ Money earned is ₹200.