The school cafeteria planned to use 3.4 tons of coal last month, which actually saved 10% compared to the plan. How many tons were saved?
学校食堂上个月计划用煤3.4吨，实际比计划节约了10%，节约了多少吨．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3.4 * (1/10)</gadget>
<output>0.34</output>

<result>0.34</result>