At a safari park, each adult ticket cost $39 and each child ticket cost $6. On Tuesday, the number of adult tickets sold was 180 less than the number of child tickets. On Wednesday, the number of adult tickets sold decreased by 10% while the number of child tickets sold increased by 35%. If a total of 1143 tickets were sold on Wednesday, how much money was collected on Tuesday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 180	2 u + 180
Change	- 0.1 u	+ 0.35 u + 63
After	0.9 u	1.35 u + 243	2.25 u + 243

10% x 1 u = ¹⁰₁₀₀ x 1 u = 0.1 u 
35% x 1 u = ³⁵₁₀₀ x 1 u = 0.35 u
35% x 180 = ³⁵₁₀₀ x 180 = 63

Number of tickets sold on Wednesday
= 0.9 u + 1.35 u + 243
= 2.25 u + 243

2.25 u + 243 = 1143
2.25 u = 1143 - 243
2.25 u = 900

1 u = 900 ÷ 2.25 = 400

Amount collected from adult tickets on Tuesday
= 1 u x 39
= 400 x 39
= $15600

Amount collected from child tickets on Tuesday
= 6(1 u + 180)
= 6(400 + 180)
= 6 x 580
= $3480

Total amount collected on Tuesday
= 15600 + 3480
= $19080

Answer(s):$19080