What is the number that is 30% less than 800?
比800少30%的数是多少．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">800 * (7/10)</gadget>
<output>560</output>

<result>560</result>