At a safari park, each adult ticket cost $39 and each child ticket cost $11. On Thursday, the number of adult tickets sold was 130 less than the number of child tickets. On Friday, the number of adult tickets sold decreased by 40% while the number of child tickets sold increased by 20%. If a total of 1056 tickets were sold on Friday, how much money was collected on Thursday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 130	2 u + 130
Change	- 0.4 u	+ 0.2 u + 26
After	0.6 u	1.2 u + 156	1.8 u + 156

40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u 
20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u
20% x 130 = ²⁰₁₀₀ x 130 = 26

Number of tickets sold on Friday
= 0.6 u + 1.2 u + 156
= 1.8 u + 156

1.8 u + 156 = 1056
1.8 u = 1056 - 156
1.8 u = 900

1 u = 900 ÷ 1.8 = 500

Amount collected from adult tickets on Thursday
= 1 u x 39
= 500 x 39
= $19500

Amount collected from child tickets on Thursday
= 11(1 u + 130)
= 11(500 + 130)
= 11 x 630
= $6930

Total amount collected on Thursday
= 19500 + 6930
= $26430

Answer(s):$26430