At a tourist attraction, each adult ticket cost $23 and each child ticket cost $13. On Monday, the number of adult tickets sold was 180 less than the number of child tickets. On Tuesday, the number of adult tickets sold decreased by 25% while the number of child tickets sold increased by 20%. If a total of 411 tickets were sold on Tuesday, how much money was collected on Monday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 180	2 u + 180
Change	- 0.25 u	+ 0.2 u + 36
After	0.75 u	1.2 u + 216	1.95 u + 216

25% x 1 u = ²⁵₁₀₀ x 1 u = 0.25 u 
20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u
20% x 180 = ²⁰₁₀₀ x 180 = 36

Number of tickets sold on Tuesday
= 0.75 u + 1.2 u + 216
= 1.95 u + 216

1.95 u + 216 = 411
1.95 u = 411 - 216
1.95 u = 195

1 u = 195 ÷ 1.95 = 100

Amount collected from adult tickets on Monday
= 1 u x 23
= 100 x 23
= $2300

Amount collected from child tickets on Monday
= 13(1 u + 180)
= 13(100 + 180)
= 13 x 280
= $3640

Total amount collected on Monday
= 2300 + 3640
= $5940

Answer(s):$5940