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(a) Difference in the cost of a polo shirt and a pair of socks

= $15.2 + $2.70 = $17.90

(b) if the price of the polo shirt is $ u , then price of a socks is $ ( u – 17.9)

4( u – 17.9 ) + 2u = 56.8

6u -71.6 = 56.8

6u = 128.4

u = 21.4

Each polo costs $21.4 .

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