At a park, each adult ticket cost $22 and each child ticket cost $8. On Thursday, the number of adult tickets sold was 75 less than the number of child tickets. On Friday, the number of adult tickets sold decreased by 35% while the number of child tickets sold increased by 20%. If a total of 275 tickets were sold on Friday, how much money was collected on Thursday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 75	2 u + 75
Change	- 0.35 u	+ 0.2 u + 15
After	0.65 u	1.2 u + 90	1.85 u + 90

35% x 1 u = ³⁵₁₀₀ x 1 u = 0.35 u 
20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u
20% x 75 = ²⁰₁₀₀ x 75 = 15

Number of tickets sold on Friday
= 0.65 u + 1.2 u + 90
= 1.85 u + 90

1.85 u + 90 = 275
1.85 u = 275 - 90
1.85 u = 185

1 u = 185 ÷ 1.85 = 100

Amount collected from adult tickets on Thursday
= 1 u x 22
= 100 x 22
= $2200

Amount collected from child tickets on Thursday
= 8(1 u + 75)
= 8(100 + 75)
= 8 x 175
= $1400

Total amount collected on Thursday
= 2200 + 1400
= $3600

Answer(s):$3600