One more suggestion: consider moving the text indicating the capital needed outside the blue area. Or at least provide another copy of that text outside the blue area.

It becomes hard to see that text with low weekly expenses($2500), close weekly revenue ($1000), and good growth rate (5%)

Not to echo other people's comments, but I am unable to click the 'change' button either (Firefox/Win7)

Doesn't work for me either (Can't drag). Firefox/Macbook (Maverick)