deltech speakers inc manufactures one type of computer speaker. the average selling price $106 per computer speaker. the average variable cost amounts to $61 per computer speaker.The comapnys fixed costs are $21000 per month

a.) calculate the monthly volume sales needed to break-even

b.) determine the break-even point in sales dollars

c.) if the companies current monthly sales amount is $146000 what is the margin of safety in dollars and in units