I'm not very good at math, unfortunately. You should have seen me in JoAnn's the other day, counting on my fingers and trying to figure out what 30% of these two different fabrics were, then half that price 'cause I was only getting half a yard of each, then what that plus my other purchases would total (I buy on an allowance, so I gotta stay under $10).
So today when I dropped in again to pick up one last fabric - I brought my cell phone and did the math on the calculator function!