At a zoo, each adult ticket cost $30 and each child ticket cost $6. On Friday, the number of adult tickets sold was 152 less than the number of child tickets. On Saturday, the number of adult tickets sold decreased by 25% while the number of child tickets sold increased by 50%. If a total of 453 tickets were sold on Saturday, how much money was collected on Friday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 152	2 u + 152
Change	- 0.25 u	+ 0.5 u + 76
After	0.75 u	1.5 u + 228	2.25 u + 228

25% x 1 u = ²⁵₁₀₀ x 1 u = 0.25 u 
50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u
50% x 152 = ⁵⁰₁₀₀ x 152 = 76

Number of tickets sold on Saturday
= 0.75 u + 1.5 u + 228
= 2.25 u + 228

2.25 u + 228 = 453
2.25 u = 453 - 228
2.25 u = 225

1 u = 225 ÷ 2.25 = 100

Amount collected from adult tickets on Friday
= 1 u x 30
= 100 x 30
= $3000

Amount collected from child tickets on Friday
= 6(1 u + 152)
= 6(100 + 152)
= 6 x 252
= $1512

Total amount collected on Friday
= 3000 + 1512
= $4512

Answer(s):$4512