Solving for Interest/ROR errors

I love the concept and features of this app, but I dont have confidence in the results. LIke "Edroid" I get inaccurate results wehn solving for Interest amounts and rates. Even the example for simple interest that is shown in the FAQs page of the authors Web site returned a different result. It would be nice to see a post from the author that an update is in process and that all algorithms are being proofed.

Has anyone tried these calcs with Calculator12 from the same author?

BrokenAero about Calc-12E RPN Financial