Granola bars 12 42 boxes have 2 what does the x value

What percent of the circle below is shaded?

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.