There were 720 T-shirts at a store. ³₈ of them were with collars. T-shirts with collars were priced at $4 each. T-shirts without collars were priced at $12 each. The store owner sold ¹₂ of the T-shirts with collars and ⁷₁₀ of the T-shirts without collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 8 u

8 u = 720

1 u = 720 ÷ 8 = 90

Number of T-shirts with collars
= 3 u
= 3 x 90
= 270

Number of T-shirts with collars sold 
= ¹₂ x 270
= 135

Number of T-shirts without collars
= 5 u
= 5 x 90
= 450

Number of T-shirts without collars sold
= ⁷₁₀ x 450
= 315

Amount that the store owner collected from the sale of the T-shirts with collars
= 135 x 4
= $540

Amount that the store owner collected from the sale of the T-shirts without collars
= 315 x 12
= $3780

Total amount that the store owner collected from all the T-shirts he sold
= 540 + 3780
= $4320

Answer(s): $4320