Answer :
There are several ways you can do it but the easiest would be 5($8.96)
y = $8.96 x b
y = total cost
$8.96 = the cost of one watermelon
b = the amount of watermelons you're purchasing
So, it'll cost approximately $44.80 to purchase 5 watermelons.
Note: There may be various equations to solve this question!