There were 400 T-shirts at a boutique. ³₅ of them were without collars. T-shirts without collars were priced at $12 each. T-shirts with collars were priced at $8 each. The boutique owner sold ¹₃ of the T-shirts without collars and ⁷₈ 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 = 400

1 u = 400 ÷ 5 = 80

Number of T-shirts without collars
= 3 u
= 3 x 80
= 240

Number of T-shirts without collars sold 
= ¹₃ x 240
= 80

Number of T-shirts with collars
= 2 u
= 2 x 80
= 160

Number of T-shirts with collars sold
= ⁷₈ x 160
= 140

Amount that the boutique owner collected from the sale of the T-shirts without collars
= 80 x 12
= $960

Amount that the boutique owner collected from the sale of the T-shirts with collars
= 140 x 8
= $1120

Total amount that the boutique owner collected from all the T-shirts he sold
= 960 + 1120
= $2080

Answer(s): $2080