A refrigerator is first reduced by 10%, and then increased by 10%, which is 4950 yuan. What is the original price?
一台冰箱先减10%，再提高10%，是4950元，则原价是多少元．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

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

<gadget id="calculator">4_950 / (11/10) / (9/10)</gadget>
<output>5_000</output>

<result>5_000</result>