At a theme park, each adult ticket cost $32 and each child ticket cost $6. On Saturday, the number of adult tickets sold was 120 less than the number of child tickets. On Sunday, the number of adult tickets sold decreased by 10% while the number of child tickets sold increased by 35%. If a total of 837 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 120	2 u + 120
Change	- 0.1 u	+ 0.35 u + 42
After	0.9 u	1.35 u + 162	2.25 u + 162

10% x 1 u = ¹⁰₁₀₀ x 1 u = 0.1 u 
35% x 1 u = ³⁵₁₀₀ x 1 u = 0.35 u
35% x 120 = ³⁵₁₀₀ x 120 = 42

Number of tickets sold on Sunday
= 0.9 u + 1.35 u + 162
= 2.25 u + 162

2.25 u + 162 = 837
2.25 u = 837 - 162
2.25 u = 675

1 u = 675 ÷ 2.25 = 300

Amount collected from adult tickets on Saturday
= 1 u x 32
= 300 x 32
= $9600

Amount collected from child tickets on Saturday
= 6(1 u + 120)
= 6(300 + 120)
= 6 x 420
= $2520

Total amount collected on Saturday
= 9600 + 2520
= $12120

Answer(s):$12120