At a zoo, each adult ticket cost $35 and each child ticket cost $13. On Saturday, the number of adult tickets sold was 90 less than the number of child tickets. On Sunday, the number of adult tickets sold decreased by 20% while the number of child tickets sold increased by 40%. If a total of 346 tickets were sold on Sunday, how much money was collected on Saturday?

	Adult tickets	Child tickets	Total tickets
Before	1 u	1 u + 90	2 u + 90
Change	- 0.2 u	+ 0.4 u + 36
After	0.8 u	1.4 u + 126	2.2 u + 126

20% x 1 u = ²⁰₁₀₀ x 1 u = 0.2 u 
40% x 1 u = ⁴⁰₁₀₀ x 1 u = 0.4 u
40% x 90 = ⁴⁰₁₀₀ x 90 = 36

Number of tickets sold on Sunday
= 0.8 u + 1.4 u + 126
= 2.2 u + 126

2.2 u + 126 = 346
2.2 u = 346 - 126
2.2 u = 220

1 u = 220 ÷ 2.2 = 100

Amount collected from adult tickets on Saturday
= 1 u x 35
= 100 x 35
= $3500

Amount collected from child tickets on Saturday
= 13(1 u + 90)
= 13(100 + 90)
= 13 x 190
= $2470

Total amount collected on Saturday
= 3500 + 2470
= $5970

Answer(s):$5970