Calculate variable costs?

Good day,

To practice for my exam, I have questions from past exams, but without the solutions. Unfortunately, I'm stuck on the following question:

Salz AG wants to sell 14,000 glasses for €12.40 in the next quarter. Fixed costs amount to €29,252. Break-even is 8,240 glasses.

Calculate the variable costs.

All I know is that the variable unit cost should be €8.85, and the variable total cost €123,900.00. However, I simply don't know how to arrive at that.