At a park, each adult ticket cost $37 and each child ticket cost $16. On Monday, the number of adult tickets sold was 80 less than the number of child tickets. On Tuesday, the number of adult tickets sold decreased by 25% while the number of child tickets sold increased by 45%. If a total of 1656 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 80	2 u + 80
Change	- 0.25 u	+ 0.45 u + 36
After	0.75 u	1.45 u + 116	2.2 u + 116

25% x 1 u = ²⁵₁₀₀ x 1 u = 0.25 u 
45% x 1 u = ⁴⁵₁₀₀ x 1 u = 0.45 u
45% x 80 = ⁴⁵₁₀₀ x 80 = 36

Number of tickets sold on Tuesday
= 0.75 u + 1.45 u + 116
= 2.2 u + 116

2.2 u + 116 = 1656
2.2 u = 1656 - 116
2.2 u = 1540

1 u = 1540 ÷ 2.2 = 700

Amount collected from adult tickets on Monday
= 1 u x 37
= 700 x 37
= $25900

Amount collected from child tickets on Monday
= 16(1 u + 80)
= 16(700 + 80)
= 16 x 780
= $12480

Total amount collected on Monday
= 25900 + 12480
= $38380

Answer(s):$38380