The selling prices of two commodities, A and B, are both 910 yuan. It is known that commodity A has made a profit of 30%, and commodity B has lost 30%.
甲乙两种商品的售价均为910元，已知甲商品赚了30%，乙商品亏了30%，这两种商品总体是赚了还是亏了，用计算说明．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">910 / (7/10)</gadget>
<output>1_300</output>

<gadget id="calculator">1_300 - 910</gadget>
<output>390</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">910 / (13/10)</gadget>
<output>700</output>

<gadget id="calculator">910 - 700</gadget>
<output>210</output>

<gadget id="calculator">390 - 210</gadget>
<output>180</output>

<result>180</result>