a) Paul makes car payments of $4371 at the end of each six month period for 2 years followed by month-end payments of $619 for a further 2 years. If interest is calculated at 6% semiannually, what was the value of the car at the time of purchase?

b) A company has a profit function given by:

Profit = CMx - 14884,

where x represents the number of units being sold and CM is the contribution margin. The company breaks even after selling 5459 units. What is the contribution margin?

c) Bill's retirement plan consists of contributing $130 at the end of each month into an RRSP. If the plan earns 5.2% compounded quarterly for the first ten years and 8% compounded semiannually thereafter, how much money will be in Bill's RRSP at the end of a thirty year term?