Markup percentage is 54%
Selling price of the scooter is $69.30
Let the cost price/non-markup price be x
The formula for markup percentage is
[tex]Markup\text{ \%}=\frac{selling\text{ price - cost price}}{\cos t\text{ price}}\times100\text{\%}[/tex]Substitute the values into the formula above
[tex]\begin{gathered} 54=\frac{69.30-x}{x}\times100 \\ \text{Crossmultiply} \\ 54x=100(69.30-x) \\ 54x=6930-100x \\ \text{Collect like terms} \\ 54x+100x=6930 \\ 154x=6930 \\ \text{Divide both sides by 154} \\ \frac{154x}{154}=\frac{6930}{154} \\ x=\text{ \$45} \end{gathered}[/tex]Hence, their non-markup/cost price is $45
