There were 240 T-shirts at a stall. ³₄ of them were without collars. T-shirts without collars were priced at $3 each. T-shirts with collars were priced at $10 each. The stall owner sold ⁴₉ 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 = 4 u

4 u = 240

1 u = 240 ÷ 4 = 60

Number of T-shirts without collars
= 3 u
= 3 x 60
= 180

Number of T-shirts without collars sold 
= ⁴₉ x 180
= 80

Number of T-shirts with collars
= 1 u
= 1 x 60
= 60

Number of T-shirts with collars sold
= ²₃ x 60
= 40

Amount that the stall owner collected from the sale of the T-shirts without collars
= 80 x 3
= $240

Amount that the stall owner collected from the sale of the T-shirts with collars
= 40 x 10
= $400

Total amount that the stall owner collected from all the T-shirts he sold
= 240 + 400
= $640

Answer(s): $640