You use the second one (except change the calculation to use 23.7%). My first calculation had incorrectly assumed that you had not used it for personal-only use before you started using it for business. I should have asked first.
You are right, the program can't handle the sale when the business percentage varied. That is why I had said to tell the vehicle section that you converted it to personal use, then enter the manually calculated amounts in the "Sale of Business Property" section.
