The price of a washing machine is first reduced by 10% and then increased by 10%. What is the difference between the price of this washing machine and the original price? What is the magnitude of the change?
一台洗衣机的售价先降低了10%后，又提高了10%，现在这台洗衣机的售价与原来比有什么变化？变化幅度是多少？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(9/10) * (11/10)</gadget>
<output>99/100 = around 0.99</output>

<gadget id="calculator">1 - (99/100)</gadget>
<output>1/100 = around 0.01</output>

<result>1/100 = around 0.01</result>