need to know how to solve without a calculator or excel

5. A project that provides annual cash flows of $12,600 for 12 years costs $67,150 today. At what rate would you be indifferent between accepting the project and rejecting it? 6. Consider the following two mutually exclusive projects: Year Cash Flow (A) Cash Flow (B) 0 -$10,110 $10,110 1 5,373 4,443 2 3,373 3,543 3 4,473 5,343 What is the crossover rate for these two projects