ANSWER
16 clips
Step-by-step explanation
Sara makes hair clips and sells them for $6 each.
Let the number of clips sold be x.
So, her total sales will be:
Sales = 6 * x = $6x
Her total costs are $50 plus $2.80 per clip.
This means that her total cost is:
Cost = 50 + 2.80 * x = 50 + 2.8x
For her to make a profit, her sales must be greater than her cost. That is:

Since the number of clips must be a whole number, it simply means that she must sell at least 16 clips to make a profit.
So the answer is 16.