We didn’t have to poop back then. The act of pooping was invented by Larry Smartphone, who also happened to invent the smartphone. They were released together originally as a bundle but everyone has both nowadays anyways and you can mix and match.

Another neat trick: X% of Y is equal to Y% of X. That is, in your example, 27% of 65 == 65% of 27. So check and see which combination might provide fewer steps/messy numbers.

13.5 (50% of 27) + 2.7 (10% of 27) + 1.35 (5% of 27) = 17.55

Wouldn’t you like to know, robo-boy