Answer:
$225
Explanation:
Since each raft hold a maximum of 8 people, divide:
70 ÷ 8 = 8.75
which means that 8.75 rafts will be needed, but since you cannot buy .75 of a raft, round up to 9 rafts, then multiply:
9 × 25 = 225
so, they will need $225 for 9 rafts
Hope this helps :)