At a bird park, each adult ticket cost $39 and each child ticket cost $10. On Monday, the number of adult tickets sold was 88 less than the number of child tickets. On Tuesday, the number of adult tickets sold decreased by 35% while the number of child tickets sold increased by 50%. If a total of 1207 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 88	2 u + 88
Change	- 0.35 u	+ 0.5 u + 44
After	0.65 u	1.5 u + 132	2.15 u + 132

35% x 1 u = ³⁵₁₀₀ x 1 u = 0.35 u 
50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u
50% x 88 = ⁵⁰₁₀₀ x 88 = 44

Number of tickets sold on Tuesday
= 0.65 u + 1.5 u + 132
= 2.15 u + 132

2.15 u + 132 = 1207
2.15 u = 1207 - 132
2.15 u = 1075

1 u = 1075 ÷ 2.15 = 500

Amount collected from adult tickets on Monday
= 1 u x 39
= 500 x 39
= $19500

Amount collected from child tickets on Monday
= 10(1 u + 88)
= 10(500 + 88)
= 10 x 588
= $5880

Total amount collected on Monday
= 19500 + 5880
= $25380

Answer(s):$25380