There were 320 T-shirts at a store. ⁵₈ of them were with collars. T-shirts with collars were priced at $3 each. T-shirts without collars were priced at $4 each. The store owner sold ¹₂ of the T-shirts with collars and ²₃ 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 = 320

1 u = 320 ÷ 8 = 40

Number of T-shirts with collars
= 5 u
= 5 x 40
= 200

Number of T-shirts with collars sold 
= ¹₂ x 200
= 100

Number of T-shirts without collars
= 3 u
= 3 x 40
= 120

Number of T-shirts without collars sold
= ²₃ x 120
= 80

Amount that the store owner collected from the sale of the T-shirts with collars
= 100 x 3
= $300

Amount that the store owner collected from the sale of the T-shirts without collars
= 80 x 4
= $320

Total amount that the store owner collected from all the T-shirts he sold
= 300 + 320
= $620

Answer(s): $620