Moolah to spend: $32.00
Apples: $4.00
Mangoes x 3: $6.00
Cheese (really expensive cheese): $5.00
Pizza: $15.00
$32.00 -$32.00 - $30.00 = change Omar received ($4.00+$6.00+$5.00+$15.00) = change Omar received
$32.00 - $30.00 = change Omar received
$2.00 = change Omar received (assuming everything he brought was tax free -- if it was, then that made up for the outrageous price for that block of cheese)