The company's capital rationing policy requires a maximum cash payback period of three years. In addition, a minimum average rate of return of $20\%$ is required on all projects. If the preceding standards are met, the net present value method and present value indexes are used to rank the remaining proposals. Giving effect to straight$-$line depreciation on the investments and assuming no estimated residual value, compute the average rate of return for each of the four proposals. Round to one decimal place.