Answer
I) $220.50
Work Step by Step
The markup price is the amount that the jewelry store is charging from the costumers on top of the original price paid. As we can see, the markup is $215\%,$ divide $215$ by $100$ to convert percentage into numbers and then multiply with the original amount of the product that is $70$. Calculating this, we get $ 150.50$. Now, add this amount to the original price of the ring ($70$ USD), it's $220.50$.
$215\div 100 = 2.15$
$2.15\cdot70 = 150.50$
$70+150.50 = 220.50$
