Whatever% of anything is just (whatever/100) * anything.
thus, what is 80% of M, well is just (80/100) * M,
what is 50% of N? well is just (50/100) * N.
we know they're both equal, thus
thus, what is 80% of M, well is just (80/100) * M,
what is 50% of N? well is just (50/100) * N.
we know they're both equal, thus
