Isn’t it supposed to be a minus sign? For it can be like w-2, w-2 ?
A 15% percent markup means that the typewriter cost was increased by 15%, or 0.15 by moving the decimal 2 places to the left. If the original price was x, and 15% of it is 0.15*x, we can add them up to get 1.15*x=129.95. Dividing both sides by 1.15, we get x=113 dollars
The decimal that’s equivalent to 28/100 is 0.28
