There were 320 T-shirts at a stall. ³₄ of them were without collars. T-shirts without collars were priced at $12 each. T-shirts with collars were priced at $6 each. The stall owner sold ¹₃ of the T-shirts without collars and ⁷₁₀ of the T-shirts with collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 4 u

4 u = 320

1 u = 320 ÷ 4 = 80

Number of T-shirts without collars
= 3 u
= 3 x 80
= 240

Number of T-shirts without collars sold 
= ¹₃ x 240
= 80

Number of T-shirts with collars
= 1 u
= 1 x 80
= 80

Number of T-shirts with collars sold
= ⁷₁₀ x 80
= 56

Amount that the stall owner collected from the sale of the T-shirts without collars
= 80 x 12
= $960

Amount that the stall owner collected from the sale of the T-shirts with collars
= 56 x 6
= $336

Total amount that the stall owner collected from all the T-shirts he sold
= 960 + 336
= $1296

Answer(s): $1296