Is this a new thing? I graduated highschool in 2001 and each grade letter was 10% and equated to a grade point.

    90%+ => A (4.0)
    80%+ => B (3.0)
    70%+ => C (2.0)
    60%+ => D or F depending (1.0 or 0.0)

At university, we only used grade points and they were very, very similar in scale.