The original price of a schoolbag is 100 yuan, and the current price is 70 yuan. How much is the price of this schoolbag reduced?
一个书包原价100元，现价70元，这个书包降了多少
<gadget id="calculator">100 - 70</gadget>
<output>30</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>