Sharps, Inc. is considering the purchase of equipment that would cost $57,600, have a useful life of 4 years, no salvage value and would result in labor savings of $21,000 per year. The internal rate of return on the investment in the equipment is closest to (factors for selected rates are presented below): 1 2 3 4 5 17% 0.855 1.585 2.210 2.743 3.199 18% 0.847 1.566 2.174 2.690 3.127 19% 0.840 1.547 2.140 2.639 3.058 20% 0.833 1.528 2.106 2.589 2.991 a. 17% b. 18% C. 20% d. 19%