A globe is 13.5 yuan, and a stapler is 4.8 yuan cheaper than the globe. How much does it cost to buy these two pieces of stationery?
一个地球仪13.5元，一台订书机比地球仪便宜4.8元，买这两件文具一共需要多少元钱？
<gadget id="calculator">13.5 - 4.8</gadget>
<output>8.7</output>

<gadget id="calculator">8.7 + 13.5</gadget>
<output>22.2</output>

<result>22.2</result>