At a tourist attraction, each adult ticket cost $27 and each child ticket cost $10. On Thursday, the number of adult tickets sold was 172 less than the number of child tickets. On Friday, the number of adult tickets sold decreased by 40% while the number of child tickets sold increased by 50%. If a total of 1518 tickets were sold on Friday, how much money was collected on Thursday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 172	2 u + 172
Change	- 0.4 u	+ 0.5 u + 86
After	0.6 u	1.5 u + 258	2.1 u + 258

40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u 
50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u
50% x 172 = ⁵⁰₁₀₀ x 172 = 86

Number of tickets sold on Friday
= 0.6 u + 1.5 u + 258
= 2.1 u + 258

2.1 u + 258 = 1518
2.1 u = 1518 - 258
2.1 u = 1260

1 u = 1260 ÷ 2.1 = 600

Amount collected from adult tickets on Thursday
= 1 u x 27
= 600 x 27
= $16200

Amount collected from child tickets on Thursday
= 10(1 u + 172)
= 10(600 + 172)
= 10 x 772
= $7720

Total amount collected on Thursday
= 16200 + 7720
= $23920

Answer(s):$23920