Y is directly proportional to x write a formula in terms of x find the value of y when x is 0.6 find the value of x when y is 38.5

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.