
Ok i understand how the answer is calculated
R :: 40*.5 = 20 television sets T :: 50*.9 = 45 television sets
45*x = 20 x = 0.44 or 44%
so R sold 44% of what T sold but it's asking "what percent less" ? i know the answer is 56% which is 1 - .44 = .56 or 56% but i'm having trouble grasping what it actually means by what percent less . . .
Well, if A is $x$ percent less than B, it means $ x=\frac{B-A}{B} $ or $ A = (1-x)\cdot B $.