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 = $<<4*300=1200>>1200
Then add the late fee: $1200 + $150 = $<<1200+150=1350>>1350
#### 1350