There were 400 T-shirts at a shop. ³₅ of them were with collars. T-shirts with collars were priced at $8 each. T-shirts without collars were priced at $6 each. The shop owner sold ¹₄ of the T-shirts with collars and ⁷₈ 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 
= ¹₄ x 240
= 60

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

Number of T-shirts without collars sold
= ⁷₈ x 160
= 140

Amount that the shop owner collected from the sale of the T-shirts with collars
= 60 x 8
= $480

Amount that the shop owner collected from the sale of the T-shirts without collars
= 140 x 6
= $840

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

Answer(s): $1320