The profit percentage gained by roger is [tex]20 \%[/tex]
SOLUTION:
Given that, Roger made [tex]\$25[/tex] profit on the stamp collection costing him [tex]\$125[/tex]. We have to find his profit as a percentage of the cost price
Profit percentage is profit gained divided by the cost price multiplied by 100.
Therefore, Profit percentage on stamp collection [tex]=\frac{\text { profit gained }}{\text { cost price }} \times 100[/tex]
Here, profit gained = [tex]\$25[/tex] and cost price = [tex]\$125[/tex]
Profit percentage [tex]=\frac{25}{125} \times 100\Rightarrow \frac{1}{5} \times 100\Rightarrow \frac{100}{5}\%\Rightarrow 20\%[/tex]
Therefore, Profit percentage = [tex]20 \%[/tex]
