There were 700 T-shirts at a stall. ⁵₇ of them were with collars. T-shirts with collars were priced at $4 each. T-shirts without collars were priced at $7 each. The stall owner sold ¹₂ of the T-shirts with collars and ⁹₁₀ 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 = 700

1 u = 700 ÷ 7 = 100

Number of T-shirts with collars
= 5 u
= 5 x 100
= 500

Number of T-shirts with collars sold 
= ¹₂ x 500
= 250

Number of T-shirts without collars
= 2 u
= 2 x 100
= 200

Number of T-shirts without collars sold
= ⁹₁₀ x 200
= 180

Amount that the stall owner collected from the sale of the T-shirts with collars
= 250 x 4
= $1000

Amount that the stall owner collected from the sale of the T-shirts without collars
= 180 x 7
= $1260

Total amount that the stall owner collected from all the T-shirts he sold
= 1000 + 1260
= $2260

Answer(s): $2260