In a factory, there are 3 machines working 23 hours a day. The owner decided to buy a fourth machine, which works only 12 hours a day. One machine can produce 2 kg of material every hour. The factory sells the produced material for $50 per 1 kg. How much can this factory earn in one day?
The total runtime for the first three machines is 3 machines * 23 hours/day/machine = 
<gadget id="calculator">3*23</gadget>
<output>69</output>
69 hours/day.
So these machines could produce 69 hours/day * 2 kg/hour = 
<gadget id="calculator">69*2</gadget>
<output>138</output>
138 kg/day.
The fourth machine could produce 12 hours/day * 2 kg/hour = 
<gadget id="calculator">12*2</gadget>
<output>24</output>
24 kg/day of material.
In total all the machines would produce 138 kg/day + 24 kg/day = 
<gadget id="calculator">138+24</gadget>
<output>162</output>
162 kg/day of material.
The factory would therefore earn 162 kg/day * $50/kg = $
<gadget id="calculator">162*50</gadget>
<output>8_100</output>
8100/day.

<result>8_100</result>