I need a calculator for this or a formula to understand these questions.. PLEASE DON'T ANWSER IF YOU DON'T KNOW THE AWNSER OR HAVE A TIP

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.