At a concert hall, each adult ticket cost $36 and each child ticket cost $9. On Wednesday, the number of adult tickets sold was 135 less than the number of child tickets. On Thursday, the number of adult tickets sold decreased by 50% while the number of child tickets sold increased by 40%. If a total of 569 tickets were sold on Thursday, how much money was collected on Wednesday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 135	2 u + 135
Change	- 0.5 u	+ 0.4 u + 54
After	0.5 u	1.4 u + 189	1.9 u + 189

50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u 
40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u
40% x 135 = ⁴⁰₁₀₀ x 135 = 54

Number of tickets sold on Thursday
= 0.5 u + 1.4 u + 189
= 1.9 u + 189

1.9 u + 189 = 569
1.9 u = 569 - 189
1.9 u = 380

1 u = 380 ÷ 1.9 = 200

Amount collected from adult tickets on Wednesday
= 1 u x 36
= 200 x 36
= $7200

Amount collected from child tickets on Wednesday
= 9(1 u + 135)
= 9(200 + 135)
= 9 x 335
= $3015

Total amount collected on Wednesday
= 7200 + 3015
= $10215

Answer(s):$10215