On Thursday, 720 more women than men attended a concert. On Friday, the number of women decreased by 50% and the number of men increased by 80%. 1004 audience attended the concert on Friday. If each ticket cost $17, how much money was collected from the sale of concert tickets on Thursday?

	Women		Men
Comparing between the women and the men at first	720 more
Before	2x5	+ 720	5x2
Change	- 1x5	- 360	+ 4x2
After	1x5	+ 360	9x2

	Women		Men
Before	10 u + 720		10 u
Change	- 5 u - 360		+ 8 u
After	5 u + 360		18 u

50% = ⁵⁰₁₀₀ = ¹₂

80% = ⁸⁰₁₀₀ = ⁴₅

50% x 720
= ⁵⁰₁₀₀ x 720
= 360

720 - 360 = 360

Total number of tickets sold on Friday 
= 5 u + 360 + 18 u
= 23 u + 360 

23 u + 360 = 1004
23 u = 1004 - 360
23 u = 644

1 u = 644 ÷ 23 = 28

Total number of tickets sold on Thursday
= 10 u + 720 + 10 u 
= 20 u + 720
= 20 x 28 + 360
= 920

Amount collected from the sale of concert tickets on Thursday
= 920 x 17
= $15640

Answer(s): $15640