At a bird park, each adult ticket cost $24 and each child ticket cost $8. On Monday, the number of adult tickets sold was 106 less than the number of child tickets. On Tuesday, the number of adult tickets sold decreased by 40% while the number of child tickets sold increased by 50%. If a total of 369 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 106	2 u + 106
Change	- 0.4 u	+ 0.5 u + 53
After	0.6 u	1.5 u + 159	2.1 u + 159

40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u 
50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u
50% x 106 = ⁵⁰₁₀₀ x 106 = 53

Number of tickets sold on Tuesday
= 0.6 u + 1.5 u + 159
= 2.1 u + 159

2.1 u + 159 = 369
2.1 u = 369 - 159
2.1 u = 210

1 u = 210 ÷ 2.1 = 100

Amount collected from adult tickets on Monday
= 1 u x 24
= 100 x 24
= $2400

Amount collected from child tickets on Monday
= 8(1 u + 106)
= 8(100 + 106)
= 8 x 206
= $1648

Total amount collected on Monday
= 2400 + 1648
= $4048

Answer(s):$4048