We use Khan academy for homeschooling and we love it.
I think it would be really useful for Khan academy to develop a Consumer Math program. As a person with a math minor in my first degree, I can tell you that 99% of the math I do in daily life is consumer math. Unless someone becomes an engineer or accountant or math teacher or some other math intensive career, the vast majority of math people do is consumer math.
And not only is consumer math the most common math people do, mistakes in it are common and costly. E.g., Credit cards companies make millions extra per year simply because people don't understand the basics of interest. Lack of understanding concerning how mortgages work was a major contributor to the housing bubble and crash that shook the whole global economy in 2008. Grocery stores manipulate people into buying items at greater prices than they are the next aisle over by fiddling with the denominations they use to describe size and price.
I think it is a tragedy that consumer math is often seen as a topic simply for those who can't handle trig and calculus. Consumer math is relevant and useful for everyone.
Thank you for your consideration.