Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
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?

### Response:
First figure out how much the electricity costs by multiplying the number of watts by the price per watt: 4 * 300 = $<<4*300=1200>>1200
Then add the late fee: 1200 + 150 = $<<1200+150=1350>>1350
#### 1350