At a concert hall, each adult ticket cost $30 and each child ticket cost $10. On Saturday, the number of adult tickets sold was 160 less than the number of child tickets. On Sunday, the number of adult tickets sold decreased by 35% while the number of child tickets sold increased by 20%. If a total of 1117 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 160	2 u + 160
Change	- 0.35 u	+ 0.2 u + 32
After	0.65 u	1.2 u + 192	1.85 u + 192

35% x 1 u = ³⁵₁₀₀ x 1 u = 0.35 u 
20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u
20% x 160 = ²⁰₁₀₀ x 160 = 32

Number of tickets sold on Sunday
= 0.65 u + 1.2 u + 192
= 1.85 u + 192

1.85 u + 192 = 1117
1.85 u = 1117 - 192
1.85 u = 925

1 u = 925 ÷ 1.85 = 500

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

Amount collected from child tickets on Saturday
= 10(1 u + 160)
= 10(500 + 160)
= 10 x 660
= $6600

Total amount collected on Saturday
= 15000 + 6600
= $21600

Answer(s):$21600