At a park, each adult ticket cost $36 and each child ticket cost $10. On Saturday, the number of adult tickets sold was 140 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 50%. If a total of 1030 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 140	2 u + 140
Change	- 0.45 u	+ 0.5 u + 70
After	0.55 u	1.5 u + 210	2.05 u + 210

45% x 1 u = ⁴⁵₁₀₀ x 1 u = 0.45 u 
50% x 1 u = ⁵⁰₁₀₀ x 1 u = 0.5 u
50% x 140 = ⁵⁰₁₀₀ x 140 = 70

Number of tickets sold on Sunday
= 0.55 u + 1.5 u + 210
= 2.05 u + 210

2.05 u + 210 = 1030
2.05 u = 1030 - 210
2.05 u = 820

1 u = 820 ÷ 2.05 = 400

Amount collected from adult tickets on Saturday
= 1 u x 36
= 400 x 36
= $14400

Amount collected from child tickets on Saturday
= 10(1 u + 140)
= 10(400 + 140)
= 10 x 540
= $5400

Total amount collected on Saturday
= 14400 + 5400
= $19800

Answer(s):$19800