I want a clear explanation please, i need to solve this

Iam so stuck. what is the worked out answer for this question?

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

Asap! i'm not good math and i'm lost.