Three mutually exclusive projects are investigated using incremental rate of return analysis. The study period is 30 years. The business has a MARR of 13.1% p.a. Projects A B c Initial investment $ 35000 68000 43000 Annual operating cost $ 16500 34000 28000 Annual income $ 23000 58000 41500 Salvage value $ 12000 15000 11000 Useful life (years) 5 5 6 The internal rate of return for project C is positive value in 2 decimal places. %. Leave your answer as a %. Leave your The incremental rate of return for Project A and B is answer as a positive value in 2 decimal places