The cement factory produced 840 tons of cement in August, and the production in September increased by 1/4 compared with that in August. How many tons of cement were produced in September?
水泥厂8月份生产水泥840吨，9月份比8月份增产(1/4)，9月份生产水泥多少吨．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">840 * (1/4)</gadget>
<output>210</output>

<gadget id="calculator">210 + 840</gadget>
<output>1_050</output>

<result>1_050</result>