There were 450 T-shirts at a store. ³₅ of them were without collars. T-shirts without collars were priced at $7 each. T-shirts with collars were priced at $9 each. The store owner sold ¹₃ of the T-shirts without collars and ⁸₉ of the T-shirts with collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 5 u

5 u = 450

1 u = 450 ÷ 5 = 90

Number of T-shirts without collars
= 3 u
= 3 x 90
= 270

Number of T-shirts without collars sold 
= ¹₃ x 270
= 90

Number of T-shirts with collars
= 2 u
= 2 x 90
= 180

Number of T-shirts with collars sold
= ⁸₉ x 180
= 160

Amount that the store owner collected from the sale of the T-shirts without collars
= 90 x 7
= $630

Amount that the store owner collected from the sale of the T-shirts with collars
= 160 x 9
= $1440

Total amount that the store owner collected from all the T-shirts he sold
= 630 + 1440
= $2070

Answer(s): $2070