To celebrate New Year's Day, the price of each storybook in the bookstore is reduced by 15%. After the price reduction, each book is 17 yuan. How much is the original price of this storybook?
为庆祝元旦，书店每本故事书降价15%出售，降价后每本17元，求这本故事书原价是多少元？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">17 / (17/20)</gadget>
<output>20</output>

<result>20</result>