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): 17% 18% 19% 20% 1 0.855 0.847 0.840 0.833 2 1.585 1.566 1.547 1.528 3 2.210 2.174 2.140 2.106 4 2.743 2.690 2.639 2.589 3.199 3.127 3.058 2.991 5 a. 19% b.18% c. 20% d. 17%