The first thing we have to do is identify the heats of the problem:
[tex]\begin{gathered} P_S\to\text{selling price} \\ C\to\cos t \\ p\to\text{percentage of profit} \end{gathered}[/tex][tex]\begin{gathered} C=84.96 \\ p=\frac{40}{100}=0.4 \end{gathered}[/tex]We calculate the profit price first by multiplying the cost value by the percentage
[tex]\begin{gathered} profit=C\cdot p \\ profit=84.96\cdot(0.4) \\ profit=33.984 \end{gathered}[/tex]Now we calculate the sale price by adding the cost and the desired profit
[tex]\begin{gathered} P_s=C+profit \\ P_s=84.96+33.984 \\ P_s=118.944 \end{gathered}[/tex]