Answer: So, By 48% cost price is marked up.
Explanation:
Since we have given that
Selling price of gaming cards = 9.99 per card
Cost price of gaming cards = 6.75 per card
Percentage that mark up the cost price by
[tex]\frac{9.99-6.75}{6.75}\times 100\\\\\frac{3.24}{6.75}\times 100\\\\=\frac{324}{6.75}\\\\=48\%[/tex]
So, By 48% cost price is marked up.