Xiaolan takes 10 yuan to the store to buy stationery. She buys 2 identical ballpoint pens, each priced at 2.2 yuan. The remaining money just buys 4 exercise books. How much is each exercise book?
小兰拿10元钱去商店买文具，她买2支同样的圆珠笔，每支价格2.2元，剩下的钱正好买4本练习本，每本练习本多少元？
<gadget id="calculator">2.2 * 2</gadget>
<output>4.4</output>

<gadget id="calculator">10 - 4.4</gadget>
<output>5.6</output>

<gadget id="calculator">5.6 / 4</gadget>
<output>1.4</output>

<result>1.4</result>