Zhe develops truss analysis software for civil engineers. He has the opportunity to contract with at most one of two clients who have approached him with development proposals. One contract pays him Si5 000 immediately, and then S22 000 at the end of the project three years from now. The other possibility pays S20 000 now and S5000 at the end of each of the three years. In either case, his expenses will be S10 000 per year. For a ALARR of 10%, which project should Zhe accept? Use an appropriate rate of return method.