Thousands of fast-food workers across 150 cities nationwide gathered today to call for a $15-an-hour minimum wage.

However, a report released today by James Sherk, senior policy analyst in labor economics at The Heritage Foundation, found that fast-food restaurants would have to boost their prices 38 percent to make up for the increased labor costs.

>>> Higher Fast-Food Wages: Higher Fast-Food Prices

Such an increase, Sherk said, would drive away about one-third of these restaurants’ customers.

If fast food’s biggest restaurants decide to raise their wages to $15 an hour, here’s how some of your favorite meals would fare.