At a theme park, each adult ticket cost $24 and each child ticket cost $16. On Thursday, the number of adult tickets sold was 140 less than the number of child tickets. On Friday, the number of adult tickets sold decreased by 50% while the number of child tickets sold increased by 15%. If a total of 1481 tickets were sold on Friday, how much money was collected on Thursday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 140	2 u + 140
Change	- 0.5 u	+ 0.15 u + 21
After	0.5 u	1.15 u + 161	1.65 u + 161

50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u 
15% x 1 u = ¹⁵₁₀₀ x 1 u = 0.15 u
15% x 140 = ¹⁵₁₀₀ x 140 = 21

Number of tickets sold on Friday
= 0.5 u + 1.15 u + 161
= 1.65 u + 161

1.65 u + 161 = 1481
1.65 u = 1481 - 161
1.65 u = 1320

1 u = 1320 ÷ 1.65 = 800

Amount collected from adult tickets on Thursday
= 1 u x 24
= 800 x 24
= $19200

Amount collected from child tickets on Thursday
= 16(1 u + 140)
= 16(800 + 140)
= 16 x 940
= $15040

Total amount collected on Thursday
= 19200 + 15040
= $34240

Answer(s):$34240