There were 420 T-shirts at a stall. ³₇ of them were without collars. T-shirts without collars were priced at $8 each. T-shirts with collars were priced at $3 each. The stall owner sold ²₅ 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 = 420

1 u = 420 ÷ 7 = 60

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

Number of T-shirts without collars sold 
= ²₅ x 180
= 72

Number of T-shirts with collars
= 4 u
= 4 x 60
= 240

Number of T-shirts with collars sold
= ⁹₁₀ x 240
= 216

Amount that the stall owner collected from the sale of the T-shirts without collars
= 72 x 8
= $576

Amount that the stall owner collected from the sale of the T-shirts with collars
= 216 x 3
= $648

Total amount that the stall owner collected from all the T-shirts he sold
= 576 + 648
= $1224

Answer(s): $1224