At a park, each adult ticket cost $35 and each child ticket cost $12. On Friday, the number of adult tickets sold was 170 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 50%. If a total of 2325 tickets were sold on Saturday, how much money was collected on Friday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 170	2 u + 170
Change	- 0.2 u	+ 0.5 u + 85
After	0.8 u	1.5 u + 255	2.3 u + 255

20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u 
50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u
50% x 170 = ⁵⁰₁₀₀ x 170 = 85

Number of tickets sold on Saturday
= 0.8 u + 1.5 u + 255
= 2.3 u + 255

2.3 u + 255 = 2325
2.3 u = 2325 - 255
2.3 u = 2070

1 u = 2070 ÷ 2.3 = 900

Amount collected from adult tickets on Friday
= 1 u x 35
= 900 x 35
= $31500

Amount collected from child tickets on Friday
= 12(1 u + 170)
= 12(900 + 170)
= 12 x 1070
= $12840

Total amount collected on Friday
= 31500 + 12840
= $44340

Answer(s):$44340