A teacher used a computer to type. In the past, he typed 220 characters in 4 minutes. Now he types 88 characters per minute. How many more characters per minute are he typing now than in the past?
一位老师用电脑打字，过去4分钟打220个字，现在每分钟打字88个，现在比过去每分钟多打多少个字？
<gadget id="calculator">220 / 4</gadget>
<output>55</output>

<gadget id="calculator">88 - 55</gadget>
<output>33</output>

<result>33</result>