[poopslide]

I've tried most calculators on Android. These are my favourites (in that order):

https://play.google.com/store/apps/details?id=cz.hipercalc.p...

https://play.google.com/store/apps/details?id=us.mathlab.and...

https://play.google.com/store/apps/details?id=com.realmax.ca...

https://play.google.com/store/apps/details?id=com.mathally.c...

com.pomegranateApps.MathStudioExpress

That last one has similarities to Mathematica. It was unpublished from the Playstore a while ago. I use version 6.0.2 which, unlike the later versions, does not calculate percentages.

Honourable emulator mention: version 2.1 of com.hp.primecalculator