There were 210 T-shirts at a shop. ³₇ of them were without collars. T-shirts without collars were priced at $11 each. T-shirts with collars were priced at $6 each. The shop owner sold ²₅ 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 = 7 u

7 u = 210

1 u = 210 ÷ 7 = 30

Number of T-shirts without collars
= 3 u
= 3 x 30
= 90

Number of T-shirts without collars sold 
= ²₅ x 90
= 36

Number of T-shirts with collars
= 4 u
= 4 x 30
= 120

Number of T-shirts with collars sold
= ²₃ x 120
= 80

Amount that the shop owner collected from the sale of the T-shirts without collars
= 36 x 11
= $396

Amount that the shop owner collected from the sale of the T-shirts with collars
= 80 x 6
= $480

Total amount that the shop owner collected from all the T-shirts he sold
= 396 + 480
= $876

Answer(s): $876