At a theme park, each adult ticket cost $30 and each child ticket cost $15. On Saturday, the number of adult tickets sold was 130 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 30%. If a total of 1219 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 130	2 u + 130
Change	- 0.2 u	+ 0.3 u + 39
After	0.8 u	1.3 u + 169	2.1 u + 169

20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u 
30% x 1 u = ³⁰₁₀₀ x 1 u = 0.3 u
30% x 130 = ³⁰₁₀₀ x 130 = 39

Number of tickets sold on Sunday
= 0.8 u + 1.3 u + 169
= 2.1 u + 169

2.1 u + 169 = 1219
2.1 u = 1219 - 169
2.1 u = 1050

1 u = 1050 ÷ 2.1 = 500

Amount collected from adult tickets on Saturday
= 1 u x 30
= 500 x 30
= $15000

Amount collected from child tickets on Saturday
= 15(1 u + 130)
= 15(500 + 130)
= 15 x 630
= $9450

Total amount collected on Saturday
= 15000 + 9450
= $24450

Answer(s):$24450