At a stadium, each adult ticket cost $34 and each child ticket cost $14. On Monday, the number of adult tickets sold was 150 less than the number of child tickets. On Tuesday, the number of adult tickets sold decreased by 15% while the number of child tickets sold increased by 30%. If a total of 1485 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 150	2 u + 150
Change	- 0.15 u	+ 0.3 u + 45
After	0.85 u	1.3 u + 195	2.15 u + 195

15% x 1 u = ¹⁵₁₀₀ x 1 u = 0.15 u 
30% x 1 u = ³⁰₁₀₀ x 1 u = 0.3 u
30% x 150 = ³⁰₁₀₀ x 150 = 45

Number of tickets sold on Tuesday
= 0.85 u + 1.3 u + 195
= 2.15 u + 195

2.15 u + 195 = 1485
2.15 u = 1485 - 195
2.15 u = 1290

1 u = 1290 ÷ 2.15 = 600

Amount collected from adult tickets on Monday
= 1 u x 34
= 600 x 34
= $20400

Amount collected from child tickets on Monday
= 14(1 u + 150)
= 14(600 + 150)
= 14 x 750
= $10500

Total amount collected on Monday
= 20400 + 10500
= $30900

Answer(s):$30900