A certain brand of digital camera has a promotional activity, and the price is reduced by 8%. On this basis, the mall returns 15% of the selling price in cash. Buying this brand of digital camera at this time is equivalent to a price reduction of what percentage?
某品牌的数码相机进行促销活动，降价8%，在此基础上，商场又返还售价15%的现金，此时买这个品牌的数码相机，相当于降价百分之多少？
<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">1 - (2/25)</gadget>
<output>23/25 = around 0.92</output>

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

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">(23/25) * (17/20)</gadget>
<output>391/500 = around 0.782</output>

<gadget id="calculator">1 - (391/500)</gadget>
<output>109/500 = around 0.218</output>

<result>109/500 = around 0.218</result>