Plz help it’s due tomorrow

Hi so we’re going to solve this problem which is: “The owner of a small store buys coats for $55.00 each. Answer parts a and b. A She sells the coats for $88.00 each. What percent of the purchase is the sale price. The sale price is % of the purchase price.”

The answer is 71.43% what you need to do is do $55*100/$77=71.43%

Why I did this equation is because I formed these two things which are

$77__100%

And $55__x=71.43%