There were 210 T-shirts at a store. ⁴₇ of them were without collars. T-shirts without collars were priced at $4 each. T-shirts with collars were priced at $9 each. The store owner sold ¹₂ of the T-shirts without collars and ⁷₁₀ of the T-shirts with collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 7 u

7 u = 210

1 u = 210 ÷ 7 = 30

Number of T-shirts without collars
= 4 u
= 4 x 30
= 120

Number of T-shirts without collars sold 
= ¹₂ x 120
= 60

Number of T-shirts with collars
= 3 u
= 3 x 30
= 90

Number of T-shirts with collars sold
= ⁷₁₀ x 90
= 63

Amount that the store owner collected from the sale of the T-shirts without collars
= 60 x 4
= $240

Amount that the store owner collected from the sale of the T-shirts with collars
= 63 x 9
= $567

Total amount that the store owner collected from all the T-shirts he sold
= 240 + 567
= $807

Answer(s): $807