At a theme park, each adult ticket cost $28 and each child ticket cost $18. On Friday, the number of adult tickets sold was 168 less than the number of child tickets. On Saturday, the number of adult tickets sold decreased by 5% while the number of child tickets sold increased by 25%. If a total of 650 tickets were sold on Saturday, how much money was collected on Friday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 168	2 u + 168
Change	- 0.05 u	+ 0.25 u + 42
After	0.95 u	1.25 u + 210	2.2 u + 210

5% x 1 u = ⁵₁₀₀ x 1 u = 0.05 u 
25% x 1 u = ²⁵₁₀₀ x 1 u = 0.25 u
25% x 168 = ²⁵₁₀₀ x 168 = 42

Number of tickets sold on Saturday
= 0.95 u + 1.25 u + 210
= 2.2 u + 210

2.2 u + 210 = 650
2.2 u = 650 - 210
2.2 u = 440

1 u = 440 ÷ 2.2 = 200

Amount collected from adult tickets on Friday
= 1 u x 28
= 200 x 28
= $5600

Amount collected from child tickets on Friday
= 18(1 u + 168)
= 18(200 + 168)
= 18 x 368
= $6624

Total amount collected on Friday
= 5600 + 6624
= $12224

Answer(s):$12224