There were 480 T-shirts at a store. ⁵₈ of them were with collars. T-shirts with collars were priced at $8 each. T-shirts without collars were priced at $12 each. The store owner sold ³₅ of the T-shirts with collars and ⁷₉ 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 = 480

1 u = 480 ÷ 8 = 60

Number of T-shirts with collars
= 5 u
= 5 x 60
= 300

Number of T-shirts with collars sold 
= ³₅ x 300
= 180

Number of T-shirts without collars
= 3 u
= 3 x 60
= 180

Number of T-shirts without collars sold
= ⁷₉ x 180
= 140

Amount that the store owner collected from the sale of the T-shirts with collars
= 180 x 8
= $1440

Amount that the store owner collected from the sale of the T-shirts without collars
= 140 x 12
= $1680

Total amount that the store owner collected from all the T-shirts he sold
= 1440 + 1680
= $3120

Answer(s): $3120