I tried C-B=15% and tht was wrong, dont copy other solutions for upvote.

The estimated negative cash flows for three design alternatives are shown below. The MARR is 12% per year and the study period is seven years. Which alternative is best based on the IRR method? Doing nothing is not an option. Which altemative would you choose as a base one' Lhoose the correct answer below. A. Atemative C B. Altemative B Analyze the difference between the base altemative and the second-chojce alternative. IRR()= \%. (Round to two decimal places.)