There were 420 T-shirts at a boutique. ⁵₇ of them were without collars. T-shirts without collars were priced at $9 each. T-shirts with collars were priced at $11 each. The boutique owner sold ²₃ of the T-shirts without collars and ⁴₅ 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
= 5 u
= 5 x 60
= 300

Number of T-shirts without collars sold 
= ²₃ x 300
= 200

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

Number of T-shirts with collars sold
= ⁴₅ x 120
= 96

Amount that the boutique owner collected from the sale of the T-shirts without collars
= 200 x 9
= $1800

Amount that the boutique owner collected from the sale of the T-shirts with collars
= 96 x 11
= $1056

Total amount that the boutique owner collected from all the T-shirts he sold
= 1800 + 1056
= $2856

Answer(s): $2856