At a stadium, each adult ticket cost $33 and each child ticket cost $13. On Thursday, the number of adult tickets sold was 130 less than the number of child tickets. On Friday, the number of adult tickets sold decreased by 45% while the number of child tickets sold increased by 20%. If a total of 856 tickets were sold on Friday, how much money was collected on Thursday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 130	2 u + 130
Change	- 0.45 u	+ 0.2 u + 26
After	0.55 u	1.2 u + 156	1.75 u + 156

45% x 1 u = ⁴⁵₁₀₀ x 1 u = 0.45 u 
20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u
20% x 130 = ²⁰₁₀₀ x 130 = 26

Number of tickets sold on Friday
= 0.55 u + 1.2 u + 156
= 1.75 u + 156

1.75 u + 156 = 856
1.75 u = 856 - 156
1.75 u = 700

1 u = 700 ÷ 1.75 = 400

Amount collected from adult tickets on Thursday
= 1 u x 33
= 400 x 33
= $13200

Amount collected from child tickets on Thursday
= 13(1 u + 130)
= 13(400 + 130)
= 13 x 530
= $6890

Total amount collected on Thursday
= 13200 + 6890
= $20090

Answer(s):$20090