At a theme park, each adult ticket cost $32 and each child ticket cost $13. On Friday, the number of adult tickets sold was 160 less than the number of child tickets. On Saturday, the number of adult tickets sold decreased by 20% while the number of child tickets sold increased by 40%. If a total of 664 tickets were sold on Saturday, how much money was collected on Friday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 160	2 u + 160
Change	- 0.2 u	+ 0.4 u + 64
After	0.8 u	1.4 u + 224	2.2 u + 224

20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u 
40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u
40% x 160 = ⁴⁰₁₀₀ x 160 = 64

Number of tickets sold on Saturday
= 0.8 u + 1.4 u + 224
= 2.2 u + 224

2.2 u + 224 = 664
2.2 u = 664 - 224
2.2 u = 440

1 u = 440 ÷ 2.2 = 200

Amount collected from adult tickets on Friday
= 1 u x 32
= 200 x 32
= $6400

Amount collected from child tickets on Friday
= 13(1 u + 160)
= 13(200 + 160)
= 13 x 360
= $4680

Total amount collected on Friday
= 6400 + 4680
= $11080

Answer(s):$11080