At a theme park, each adult ticket cost $38 and each child ticket cost $10. On Saturday, the number of adult tickets sold was 180 less than the number of child tickets. On Sunday, the number of adult tickets sold decreased by 20% while the number of child tickets sold increased by 5%. If a total of 1669 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 180	2 u + 180
Change	- 0.2 u	+ 0.05 u + 9
After	0.8 u	1.05 u + 189	1.85 u + 189

20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u 
5% x 1 u = ⁵₁₀₀ x 1 u = 0.05 u
5% x 180 = ⁵₁₀₀ x 180 = 9

Number of tickets sold on Sunday
= 0.8 u + 1.05 u + 189
= 1.85 u + 189

1.85 u + 189 = 1669
1.85 u = 1669 - 189
1.85 u = 1480

1 u = 1480 ÷ 1.85 = 800

Amount collected from adult tickets on Saturday
= 1 u x 38
= 800 x 38
= $30400

Amount collected from child tickets on Saturday
= 10(1 u + 180)
= 10(800 + 180)
= 10 x 980
= $9800

Total amount collected on Saturday
= 30400 + 9800
= $40200

Answer(s):$40200