Uncle Zhang went to the stationery store and bought 2 pens, each of which cost 18 yuan. He paid the salesperson 100 yuan, how much should he get back? (Column comprehensive formula solution)
张叔叔到文具用品商店买了2枝钢笔，每枝钢笔18元．他付给营业员100元，应找回多少元？(列综合算式解答)
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">100 - 36</gadget>
<output>64</output>

<result>64</result>