Earned Value (EV) calculation formulas

There are several questions in PMP exam requires you to do certain calculations and most of the time the value of EV is not provided. Here are the ways you could find EV.

EV = SPI X PV
EV = CV / AC
EV = SV + PV
EV = CPI X AC

I got these formulas off from Rita's software. Based on my experience (Flunked once in the exam) the value of EV is not given and it is difficult to calculate EV. Remember EV value is required in pretty much all calculation formulas.

Thanks.