There were 300 T-shirts at a boutique. ²₅ of them were with collars. T-shirts with collars were priced at $6 each. T-shirts without collars were priced at $7 each. The boutique owner sold ²₃ of the T-shirts with collars and ²₃ 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 = 300

1 u = 300 ÷ 5 = 60

Number of T-shirts with collars
= 2 u
= 2 x 60
= 120

Number of T-shirts with collars sold 
= ²₃ x 120
= 80

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

Number of T-shirts without collars sold
= ²₃ x 180
= 120

Amount that the boutique owner collected from the sale of the T-shirts with collars
= 80 x 6
= $480

Amount that the boutique owner collected from the sale of the T-shirts without collars
= 120 x 7
= $840

Total amount that the boutique owner collected from all the T-shirts he sold
= 480 + 840
= $1320

Answer(s): $1320