Liangliang buys a set of books, and it only costs 105 yuan to buy online, which is 1/8 cheaper than buying in a bookstore. How much does it cost to buy a set of books in a bookstore?
亮亮买一套书，在网上购买只用了105元，比在书店购买便宜(1/8)，在书店购买这套书需要多少元？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 - (1/8)</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">105 / (7/8)</gadget>
<output>120</output>

<result>120</result>