Darla needs to pay $4/watt of electricity for 300 watts of electricity, plus a $150 late fee. How much does she pay in total?
First find the total cost of the electricity: $4/watt * 300 watts = $
<gadget id="calculator">4*300</gadget>
<output>1_200</output>
1200.
Then add the late fee: $1200 + $150 = $
<gadget id="calculator">1200+150</gadget>
<output>1_350</output>
1350.

<result>1_350</result>