There were 280 T-shirts at a store. ³₄ of them were with collars. T-shirts with collars were priced at $6 each. T-shirts without collars were priced at $8 each. The store owner sold ²₅ of the T-shirts with collars and ³₅ of the T-shirts without collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 4 u

4 u = 280

1 u = 280 ÷ 4 = 70

Number of T-shirts with collars
= 3 u
= 3 x 70
= 210

Number of T-shirts with collars sold 
= ²₅ x 210
= 84

Number of T-shirts without collars
= 1 u
= 1 x 70
= 70

Number of T-shirts without collars sold
= ³₅ x 70
= 42

Amount that the store owner collected from the sale of the T-shirts with collars
= 84 x 6
= $504

Amount that the store owner collected from the sale of the T-shirts without collars
= 42 x 8
= $336

Total amount that the store owner collected from all the T-shirts he sold
= 504 + 336
= $840

Answer(s): $840