Answer:
$1.89 per balloon
Step-by-step explanation:
He spent 1.89 on each balloon in the first store
7.56 divided by 4 is 1.89
He spent 1.89 on each balloon in the second store
22.68 divided by 12 is 1.89
If you combine the total spent and balloons purchased, you would still get 1.89 per balloon
30.24 divided by 16 is 1.89