Lizzy: 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?.
Me: Hmmm, let me think. I think this is the detailed solution:
First find the total cost of the electricity: $4 / watt * 300 watts = $1200. Then add the late fee: $1200 + $150 = $1350. Final answer: 1350.