You just add 8,707.37 on top of Mt. KcKinley :)
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
** x + 5 = 7
x = 2
** x + 5 = 9
x = 4
{2,4}
