At a park, each adult ticket cost $34 and each child ticket cost $7. On Friday, the number of adult tickets sold was 145 less than the number of child tickets. On Saturday, the number of adult tickets sold decreased by 45% while the number of child tickets sold increased by 20%. If a total of 1049 tickets were sold on Saturday, how much money was collected on Friday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 145	2 u + 145
Change	- 0.45 u	+ 0.2 u + 29
After	0.55 u	1.2 u + 174	1.75 u + 174

45% x 1 u = ⁴⁵₁₀₀ x 1 u = 0.45 u 
20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u
20% x 145 = ²⁰₁₀₀ x 145 = 29

Number of tickets sold on Saturday
= 0.55 u + 1.2 u + 174
= 1.75 u + 174

1.75 u + 174 = 1049
1.75 u = 1049 - 174
1.75 u = 875

1 u = 875 ÷ 1.75 = 500

Amount collected from adult tickets on Friday
= 1 u x 34
= 500 x 34
= $17000

Amount collected from child tickets on Friday
= 7(1 u + 145)
= 7(500 + 145)
= 7 x 645
= $4515

Total amount collected on Friday
= 17000 + 4515
= $21515

Answer(s):$21515