There were 150 T-shirts at a stall. ²₅ of them were with collars. T-shirts with collars were priced at $10 each. T-shirts without collars were priced at $6 each. The stall owner sold ¹₅ of the T-shirts with collars and ⁸₉ of the T-shirts without collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 5 u

5 u = 150

1 u = 150 ÷ 5 = 30

Number of T-shirts with collars
= 2 u
= 2 x 30
= 60

Number of T-shirts with collars sold 
= ¹₅ x 60
= 12

Number of T-shirts without collars
= 3 u
= 3 x 30
= 90

Number of T-shirts without collars sold
= ⁸₉ x 90
= 80

Amount that the stall owner collected from the sale of the T-shirts with collars
= 12 x 10
= $120

Amount that the stall owner collected from the sale of the T-shirts without collars
= 80 x 6
= $480

Total amount that the stall owner collected from all the T-shirts he sold
= 120 + 480
= $600

Answer(s): $600