There were 450 T-shirts at a boutique. ²₅ of them were without collars. T-shirts without collars were priced at $3 each. T-shirts with collars were priced at $12 each. The boutique owner sold ⁵₆ 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 = 5 u

5 u = 450

1 u = 450 ÷ 5 = 90

Number of T-shirts without collars
= 2 u
= 2 x 90
= 180

Number of T-shirts without collars sold 
= ⁵₆ x 180
= 150

Number of T-shirts with collars
= 3 u
= 3 x 90
= 270

Number of T-shirts with collars sold
= ⁴₅ x 270
= 216

Amount that the boutique owner collected from the sale of the T-shirts without collars
= 150 x 3
= $450

Amount that the boutique owner collected from the sale of the T-shirts with collars
= 216 x 12
= $2592

Total amount that the boutique owner collected from all the T-shirts he sold
= 450 + 2592
= $3042

Answer(s): $3042