SOLUTION: Mark buys last years best-selling novel, in hardcover, for $26.35. This is with a 15% discount from the original price. What was the original price of the novel?
Let x be the original price (the value under the question).
The from the condition you have this equation
x - 0.15x = 26.35,
or
x*(1-0.15) = 26.35
or
0.85x = 26.35,
which gives you the ANSWER
x = = 31 dollar.