For a commercial house, the installment payment is 5% more than the fixed price. After careful calculation, Uncle Wang found that the installment payment is 210,000 yuan. What is the price of this commercial house?
某商品房，分期付款比定价多付5%，王叔叔细算后，发现分期付款要21万元，这套商品房定价是多少万元？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">21 / (21/20)</gadget>
<output>20</output>

<result>20</result>