There were 490 T-shirts at a boutique. ⁴₇ of them were with collars. T-shirts with collars were priced at $5 each. T-shirts without collars were priced at $4 each. The boutique owner sold ¹₅ of the T-shirts with collars and ⁶₇ of the T-shirts without collars. How much did he collect from all the T-shirts he sold?
Number of T-shirts = 7 u

7 u = 490

1 u = 490 ÷ 7 = 70

Number of T-shirts with collars
= 4 u
= 4 x 70
= 280

Number of T-shirts with collars sold 
= ¹₅ x 280
= 56

Number of T-shirts without collars
= 3 u
= 3 x 70
= 210

Number of T-shirts without collars sold
= ⁶₇ x 210
= 180

Amount that the boutique owner collected from the sale of the T-shirts with collars
= 56 x 5
= $280

Amount that the boutique owner collected from the sale of the T-shirts without collars
= 180 x 4
= $720

Total amount that the boutique owner collected from all the T-shirts he sold
= 280 + 720
= $1000

Answer(s): $1000