A store sold 1,200 shirts in May, and the sales volume in June increased by 20% compared to May. How many shirts were sold in June?
某商店5月份销售衬衫1200件，六月份的销售量比5月份增长了20%，六月份销售衬衫多少件？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1_200 * (6/5)</gadget>
<output>1_440</output>

<result>1_440</result>