Answer:
$2
Explanation:
Fees = $18
Locker fee =$d
Total cost for 2 people,including locker for 2 people
=$40
2($18 + d) = $40
$36 +2d = $40
2d = $4
d = $2
if you want to check
Fees for one people =$18
Two people =$18 × 2 = $36
Total cost for 2 people - locker for 2 people = $40 - $ 2($2) = $40 - $4 = $36