How do I count the number of purchases that exceeds $100

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Python

Python3.3

The purchases made by a customer in a year are stored in a list. You are required to count the number of purchases that exceeds $100.

Rearrange the code in the correct sequence to form a function that receives a list of numbers representing the purchase amount per month and counts the number of times
that the purchase amount is 100 or more. The total number of times is returned by the function.

1 def num_purchase(monthly_amounts):
2 count = 0
3 if amount >=100
4 return count

What I have tried:

I tried this, but it seems wrong 1-3-2-4.