If a product is sold for 490 yuan, it will lose 2%. If it wants to make a profit of 15%, how much should the price be marked?
一种商品若以490元卖出就亏本2%，若要盈利15%，应标价多少元？
<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">1 - (1/50)</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">490 / (49/50)</gadget>
<output>500</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">500 * (23/20)</gadget>
<output>575</output>

<result>575</result>