Blue Spruce, Inc. is considering purchasing equipment costing $72000 with a 6-year useful life. The equipment will provide annual cost savings of $175 14 and will be depreciated straight-line over its useful life with no salvage value. Blue Spruce requires a 10% rate of return. Present Value of an Annuity of 1 Period % 9% 10% 11% 12% 15% 6 4.623 4.486 4.355 4.231 4.111 3.784 What is the approximate internal rate of return for this investment? 0 10% O 11% O 9% O 12%