At a bird park, each adult ticket cost $37 and each child ticket cost $9. On Saturday, the number of adult tickets sold was 75 less than the number of child tickets. On Sunday, the number of adult tickets sold decreased by 45% while the number of child tickets sold increased by 20%. If a total of 1490 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 75	2 u + 75
Change	- 0.45 u	+ 0.2 u + 15
After	0.55 u	1.2 u + 90	1.75 u + 90

45% x 1 u = ⁴⁵₁₀₀ x 1 u = 0.45 u 
20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u
20% x 75 = ²⁰₁₀₀ x 75 = 15

Number of tickets sold on Sunday
= 0.55 u + 1.2 u + 90
= 1.75 u + 90

1.75 u + 90 = 1490
1.75 u = 1490 - 90
1.75 u = 1400

1 u = 1400 ÷ 1.75 = 800

Amount collected from adult tickets on Saturday
= 1 u x 37
= 800 x 37
= $29600

Amount collected from child tickets on Saturday
= 9(1 u + 75)
= 9(800 + 75)
= 9 x 875
= $7875

Total amount collected on Saturday
= 29600 + 7875
= $37475

Answer(s):$37475