Answer:
62.5%
Step-by-step explanation:
We can write a proportion. We know that $50 is the original value and $80 is the marked up price. We don't know the marked up percentage. Let's call it x. We write equal ratios of [tex]\frac{x}{100}[/tex] comparing percent and [tex]\frac{50}{80}[/tex] comparing the 50 to the marked up price. We then set them equal.
[tex]\frac{x}{100} =\frac{50}{80}[/tex]
We then cross multiply across the equal sign from numerator to the opposite numerator.
80(x)=50(100)
80x=5000
We divide to find x.
x=62.5
This means the bicycles are marked up 62.5% and the original value is 37.5%.
