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

### Instruction:
Betty is growing parsnips in her vegetable garden. When the parsnips are grown, they are harvested and bundled into boxes that can hold up to 20 parsnips each. Each harvest, three-quarters of the boxes are full, and the remaining boxes are half-full. She gets an average of 20 boxes each harvest. How many parsnips does Betty grow in an average harvest?

### Response:
If three-quarters of the boxes are full, then 1 – ¾ = ¼ of the boxes are half-full.
On average, each harvest therefore has 20 boxes * 0.25 = <<20*0.25=5>>5 boxes that are half-full.
This means there are 20 total boxes – 5 half-full boxes = <<20-5=15>>15 full boxes.
In total, the full and half-full boxes hold 15 full boxes * 20 parsnips per full box + 5 half-full boxes * 10 parsnips per half-full box = <<15*20+5*10=350>>350 parsnips.
#### 350