A mobile phone has a price reduction promotion. The price is reduced by 10%. If you buy it in an online store, you will get a 5% rebate. At this time, if you buy it online, what percentage is the reduction?
一种手机进行降价促销活动，降价10%，在网上商城购买，还有5%的返利，这时候在网上购买，相当于降低了百分之几？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 - (1/20)</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">(9/10) * (19/20)</gadget>
<output>171/200 = around 0.855</output>

<gadget id="calculator">1 - (171/200)</gadget>
<output>29/200 = around 0.145</output>

<result>29/200 = around 0.145</result>