Jenna bought tee shirts for $4.50 each. she is selling then for $6 each. what was the percent of the mark up?

Price at which Jenna bought a single tee shirt = $4.50
Selling price of each tee shirt $6
Then
Profit on each tee shirt made by Jenna = (6 - 4.50) dollars
                                                               = 1.50 dollars
Percentage of profit made by Jenna on each shirt = (1.5/4.5) * 100 percent
                                                                                 = 150/4.5 percent
                                                                                = 33.33 percent.
The percentage on the mark up price for Jenna was 33.33%. I hope I have helped you and the procedure for doing such problems is clear to you.