There were 210 T-shirts at a shop. ⁴₇ of them were without collars. T-shirts without collars were priced at $8 each. T-shirts with collars were priced at $10 each. The shop owner sold ¹₂ of the T-shirts without collars and ⁹₁₀ 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
= 4 u
= 4 x 30
= 120

Number of T-shirts without collars sold 
= ¹₂ x 120
= 60

Number of T-shirts with collars
= 3 u
= 3 x 30
= 90

Number of T-shirts with collars sold
= ⁹₁₀ x 90
= 81

Amount that the shop owner collected from the sale of the T-shirts without collars
= 60 x 8
= $480

Amount that the shop owner collected from the sale of the T-shirts with collars
= 81 x 10
= $810

Total amount that the shop owner collected from all the T-shirts he sold
= 480 + 810
= $1290

Answer(s): $1290