At a concert hall, each adult ticket cost $24 and each child ticket cost $16. On Monday, the number of adult tickets sold was 200 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 10%. If a total of 730 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 200	2 u + 200
Change	- 0.4 u	+ 0.1 u + 20
After	0.6 u	1.1 u + 220	1.7 u + 220

40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u 
10% x 1 u = ¹⁰₁₀₀ x 1 u = 0.1 u
10% x 200 = ¹⁰₁₀₀ x 200 = 20

Number of tickets sold on Tuesday
= 0.6 u + 1.1 u + 220
= 1.7 u + 220

1.7 u + 220 = 730
1.7 u = 730 - 220
1.7 u = 510

1 u = 510 ÷ 1.7 = 300

Amount collected from adult tickets on Monday
= 1 u x 24
= 300 x 24
= $7200

Amount collected from child tickets on Monday
= 16(1 u + 200)
= 16(300 + 200)
= 16 x 500
= $8000

Total amount collected on Monday
= 7200 + 8000
= $15200

Answer(s):$15200