Cp of 300 shirts = $1800
Cp of 1 shirt = [tex] \frac{1800 }{300} = 6[/tex]
Profit/Gain = Sp - Cp
= $10 - $6 = $4
Profit/Gain % = [tex] \frac{profit}{cp} \times 100[/tex]
[tex] = \frac{4}{6} \times 100 \\ = \frac{2}{3} \times 100 \\ = 2 \times 33.33 \\ = 66.66\%[/tex]
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