At a bird park, each adult ticket cost $27 and each child ticket cost $5. On Saturday, the number of adult tickets sold was 120 less than the number of child tickets. On Sunday, the number of adult tickets sold decreased by 15% while the number of child tickets sold increased by 5%. If a total of 696 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 120	2 u + 120
Change	- 0.15 u	+ 0.05 u + 6
After	0.85 u	1.05 u + 126	1.9 u + 126

15% x 1 u = ¹⁵₁₀₀ x 1 u = 0.15 u 
5% x 1 u = ⁵₁₀₀ x 1 u = 0.05 u
5% x 120 = ⁵₁₀₀ x 120 = 6

Number of tickets sold on Sunday
= 0.85 u + 1.05 u + 126
= 1.9 u + 126

1.9 u + 126 = 696
1.9 u = 696 - 126
1.9 u = 570

1 u = 570 ÷ 1.9 = 300

Amount collected from adult tickets on Saturday
= 1 u x 27
= 300 x 27
= $8100

Amount collected from child tickets on Saturday
= 5(1 u + 120)
= 5(300 + 120)
= 5 x 420
= $2100

Total amount collected on Saturday
= 8100 + 2100
= $10200

Answer(s):$10200