A chemical fertilizer factory actually produced 210 tons of fertilizers in March, exceeding 50% of the original plan. How many tons were the overproduction?
某化肥厂三月份实际生产化肥210吨，超过原计划的50%，超产多少吨？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">210 / (3/2)</gadget>
<output>140</output>

<gadget id="calculator">210 - 140</gadget>
<output>70</output>

<result>70</result>