In my opinion, 69% is never a good grade. In my school that is a F.
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I'm in 7th grade And I started algebra in 6th grade. Is that what your looking for??
year
0.75 year = 3/4 year = 9 months
Sorry I really don't know.
(t - l) / l * 100%, where t = value this year and l = value last year