An Italian restaurant earns $600 every weekday and twice as much on the weekend. How much money does it earn by the end of the month?
On weekdays it earns $600/weekday * 5 weekdays = $
<gadget id="calculator">600*5</gadget>
<output>3_000</output>
3000.
During the weekend it earns twice as much each day so it makes ($600 * 2)/weekend day * 2 weekend days = $
<gadget id="calculator">(600*2)*2</gadget>
<output>2_400</output>
2400.
Every week it earns $3000 + $2400 = $
<gadget id="calculator">3000+2400</gadget>
<output>5_400</output>
5400.
By the end of the month, it earns $5400/week * 4 weeks = $21600.

<result>21_600</result>