Hello, can somebody help me with a financial break even question for my marketing class? I have the correct answer but don't know how to solve? Any help would be greatly appreciated!

A vendor on Peachtree sells bratwurst hot dogs for $4.10. His cart is open from 9 - 5, Monday through Friday. His variable costs average $0.65 per hot dog (depending mostly on toppings and condiments). He is considering a price increase to $4.60. Calculate the percent profit breakeven metric for this price change. Report your answer as a percentage (whole number) and round to the nearest percentage point. Answer: - 13