There were 720 T-shirts at a shop. ⁵₈ of them were without collars. T-shirts without collars were priced at $4 each. T-shirts with collars were priced at $7 each. The shop owner sold ¹₂ of the T-shirts without collars and ²₃ of the T-shirts with 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 without collars
= 5 u
= 5 x 90
= 450

Number of T-shirts without collars sold 
= ¹₂ x 450
= 225

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

Number of T-shirts with collars sold
= ²₃ x 270
= 180

Amount that the shop owner collected from the sale of the T-shirts without collars
= 225 x 4
= $900

Amount that the shop owner collected from the sale of the T-shirts with collars
= 180 x 7
= $1260

Total amount that the shop owner collected from all the T-shirts he sold
= 900 + 1260
= $2160

Answer(s): $2160