I have a calculator that is correct 80% of the time. But don't worry, every time I use it, I check the results myself.
@MartinEscardo 80%? You must have a better one than mine. Mine's only right 50% of the time, but I'm a glass half full kind of person so the mistakes make me even more grateful for that 50% and that they replaced those less polite, 100% right ones with these new ingratiating buddies. Plus, mine has a subscription, which I'm proud to pay to support the development of more politely phrased mistakes in the future!