There were 140 T-shirts at a store. ⁵₇ of them were with collars. T-shirts with collars were priced at $9 each. T-shirts without collars were priced at $12 each. The store owner sold ¹₁₀ of the T-shirts with collars and ³₅ of the T-shirts without collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 7 u

7 u = 140

1 u = 140 ÷ 7 = 20

Number of T-shirts with collars
= 5 u
= 5 x 20
= 100

Number of T-shirts with collars sold 
= ¹₁₀ x 100
= 10

Number of T-shirts without collars
= 2 u
= 2 x 20
= 40

Number of T-shirts without collars sold
= ³₅ x 40
= 24

Amount that the store owner collected from the sale of the T-shirts with collars
= 10 x 9
= $90

Amount that the store owner collected from the sale of the T-shirts without collars
= 24 x 12
= $288

Total amount that the store owner collected from all the T-shirts he sold
= 90 + 288
= $378

Answer(s): $378