At a stadium, each adult ticket cost $21 and each child ticket cost $6. On Thursday, the number of adult tickets sold was 68 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 50%. If a total of 1127 tickets were sold on Friday, how much money was collected on Thursday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 68	2 u + 68
Change	- 0.45 u	+ 0.5 u + 34
After	0.55 u	1.5 u + 102	2.05 u + 102

45% x 1 u = ⁴⁵₁₀₀ x 1 u = 0.45 u 
50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u
50% x 68 = ⁵⁰₁₀₀ x 68 = 34

Number of tickets sold on Friday
= 0.55 u + 1.5 u + 102
= 2.05 u + 102

2.05 u + 102 = 1127
2.05 u = 1127 - 102
2.05 u = 1025

1 u = 1025 ÷ 2.05 = 500

Amount collected from adult tickets on Thursday
= 1 u x 21
= 500 x 21
= $10500

Amount collected from child tickets on Thursday
= 6(1 u + 68)
= 6(500 + 68)
= 6 x 568
= $3408

Total amount collected on Thursday
= 10500 + 3408
= $13908

Answer(s):$13908