There were 400 T-shirts at a boutique. ³₅ of them were with collars. T-shirts with collars were priced at $10 each. T-shirts without collars were priced at $6 each. The boutique owner sold ¹₅ of the T-shirts with collars and ⁷₁₀ 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 = 400

1 u = 400 ÷ 5 = 80

Number of T-shirts with collars
= 3 u
= 3 x 80
= 240

Number of T-shirts with collars sold 
= ¹₅ x 240
= 48

Number of T-shirts without collars
= 2 u
= 2 x 80
= 160

Number of T-shirts without collars sold
= ⁷₁₀ x 160
= 112

Amount that the boutique owner collected from the sale of the T-shirts with collars
= 48 x 10
= $480

Amount that the boutique owner collected from the sale of the T-shirts without collars
= 112 x 6
= $672

Total amount that the boutique owner collected from all the T-shirts he sold
= 480 + 672
= $1152

Answer(s): $1152