The price of an iPhone fell 10% in a particular month and another 20% in the second month.  If the initial price was $1000, calculate the price after the second month.
In the first month, the price of the iPhone fell by 10/100*$1000=$
<gadget id="calculator">10/100*1000</gadget>
<output>100</output>
100.
The new price after the first month is $1000-$100 = $
<gadget id="calculator">1000-100</gadget>
<output>900</output>
900.
In the second month, the price fell 20% further by 20/100*$900 = $
<gadget id="calculator">20/100*900</gadget>
<output>180</output>
180.
The new price after the second month is $900-$180 = $
<gadget id="calculator">900-180</gadget>
<output>720</output>
720.

<result>720</result>