[Grade 10 Economics] No idea how to calculate break even point for two different prices

I’m trying to calculate the break even point of a t shirt company side hustle i ran.

I have fixed costs I think of $622. Because that’s how much money I invested into the business.

Then I began to sell the shirts for $12 for 8 days. Then increased the price to $15. How do I calculate the break even point with the price increase.