Given:
The number of T-shirts, N=40.
The cost of each T-shirt, c=$4.
The selling price of each shirt, s=$7.50.
The total cost price of N=40 T-shirts is,
[tex]\begin{gathered} CP=Nc \\ =40\times4 \\ =160 \end{gathered}[/tex]The total selling price of N=40 T-shirts is,
[tex]\begin{gathered} SP=Ns \\ =40\times7.5 \\ =300 \end{gathered}[/tex]The profit earned by Amelia is $300.
