Alolly costs half the price of a bar of chocolate. the total cost of a lolly and bar of chocolate is 36p. how much does a bar of chocolate cost ?

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.