At a theme park, each adult ticket cost $28 and each child ticket cost $11. On Friday, the number of adult tickets sold was 120 less than the number of child tickets. On Saturday, the number of adult tickets sold decreased by 15% while the number of child tickets sold increased by 40%. If a total of 1743 tickets were sold on Saturday, how much money was collected on Friday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 120	2 u + 120
Change	- 0.15 u	+ 0.4 u + 48
After	0.85 u	1.4 u + 168	2.25 u + 168

15% x 1 u = ¹⁵₁₀₀ x 1 u = 0.15 u 
40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u
40% x 120 = ⁴⁰₁₀₀ x 120 = 48

Number of tickets sold on Saturday
= 0.85 u + 1.4 u + 168
= 2.25 u + 168

2.25 u + 168 = 1743
2.25 u = 1743 - 168
2.25 u = 1575

1 u = 1575 ÷ 2.25 = 700

Amount collected from adult tickets on Friday
= 1 u x 28
= 700 x 28
= $19600

Amount collected from child tickets on Friday
= 11(1 u + 120)
= 11(700 + 120)
= 11 x 820
= $9020

Total amount collected on Friday
= 19600 + 9020
= $28620

Answer(s):$28620