b. Compute the payback period for each machine model.

LalaDel Company is considering two models of the new assembly machines that should produce considerable cost savings in its assembly line. The cost of each machine model is RM14,000, and there is no salvage value at the end of a 4-year useful life. The company's required rate of return is at 12% and the company prefers that a project return its initial outlay within the first half of the project's life. The annual after-tax cash savings for each machine are provided in the following table