At a community market, three students recorded their expenses.

- Omar bought a sketchbook for 23.50 AED and colour pencils for 12.35 AED.
- Fatima purchased toys costing 56.40 AED, but she got a refund of 20.00 AED for a damaged toy.
-Khalid spent 17.60 AED on snacks and 8.90 AED on a drink.

Answer the following:

a) How much money did Omar spend altogether?