Question

# Rehana bought a pencil box for Rs. 37.90. If she gave a 50 rupee note to the shopkeeper, how much money did she get back?

Money she gave to the shopkeeper $= Rs.50$
Cost of the pencil box $= Rs.37.90$
$= 50 - 37.90 \\ = Rs12.10 \\$
Hence, the shopkeeper returned her $Rs.12.10$