Four people, A, B, C, and D, pay the same amount of money to jointly buy a batch of notebooks. When dividing the books, each of B, C, and D has eight more copies than A, so each of these three people gives A 0.7 yuan each. How much per copy?
甲乙丙丁四人出同样多的钱合买一批本子，分本时，乙丙丁三人每人都比甲多八本，因而这三人每人分别给甲0.7元．求每本多少钱？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 * (3/4)</gadget>
<output>6</output>

<gadget id="calculator">8 - 6</gadget>
<output>2</output>

<gadget id="calculator">0.7 / 2</gadget>
<output>0.35</output>

<result>0.35</result>