Jeez! How many folks out there think calculating 150% of a number is hard maths?
Its not integration!
I'm not a natural at maths, thats why I use a calculator. Quick, easy and correct. I really don't understand the big deal. I get that, from a business point of view, you want to sell your product to the widest possible target audience, but do people really freak out when asked to halve, double or third a simple number? How do they function in day to day life?