A supermarket has a monthly income of 300,000 yuan, and there is 270,000 yuan left after paying taxes. What is the tax rate for the supermarket?
一个超市的月收入为30万元，交税后还剩27万元，超市纳税的税率为多少
<gadget id="calculator">30 - 27</gadget>
<output>3</output>

<gadget id="calculator">3 / 30</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/10) * 1</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>