Answer:
$180 was collected from Grade 9 students
Explanation:
40% of 120 students is 48. This means that 48 students went. If half of these students paid half price, 24 students paid $2.50, and 24 students paid $5.00.
24 x 2.5 is 60
24 x 5 is 120
60 + 120 is 180, which is the total amount of money collected.