There are 420 air conditioners in a shopping mall, which has increased by 10% this week. How many air conditioners are there now?
某商场有空调420台，这周增加了10%，现在有空调多少台？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">420 * (11/10)</gadget>
<output>462</output>

<result>462</result>