The auditorium had 2240 seats. There were 40% fewer $50-seats than $15-seats. 80% of the $15-seats and some $50-seats were sold. A total of $32700 was collected. How many seats were unsold?

	$50	$15	Total
Number	3 u	5 u	8 u

100% - 40% = 60%
⁶⁰₁₀₀ = ³₅

Total number of seats
= 3 u + 5 u
= 8 u

8 u = 2240

1 u = 2240 ÷ 8 = 280

Total number of $15-seat tickets
= 5 u
= 5 x 280
= 1400

Number of $15-seat tickets sold
= 80% x 1400
= ⁸⁰₁₀₀ x 1400
= 1120

Amount collected from $15-seat tickets sold
= 1120 x 15
= $16800

Amount collected from $50-seat tickets sold
= 32700 - 16800
= $15900

Number of $50-seat tickets sold
= 15900 ÷ 50
= 318

Number of tickets sold
= 1120 + 318
= 1438

Number of tickets left unsold
= 2240 - 1438
= 802

Answer(s): 802