A factory produces a batch of chemical fertilizers. It is planned to produce 12.4 tons per day, which takes 21 days to complete, but it actually only took 15 days. How many tons of fertilizers are actually produced per day?
某工厂生产一批化肥，计划每天生产12.4吨，21天完成，但实际只用了15天．实际每天生产化肥多少吨？
<gadget id="calculator">21 / 15</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">12.4 * (7/5)</gadget>
<output>17.36</output>

<result>17.36</result>