"...Arithmetic wasn't your favorite subject..." S'why Texas Instruments invented the calculator. Save all of us who got hit by that nun for being mathematically challenged. snicker.
Real issue with AP is that a lot of ranges won't let you use it.
Anyway, one ammo site wants $46.95 per 20 for Norwegian .30 AP. Another place in WA., wants $495.00 for a 192 round can of Korean War vintage .30 AP.