Answer:
It will take a minimum of 13 weeks before Josephine makes a profit.
Explanation:
Let it takes w weeks for Josephine to make profit.
So, her weekly sales over 550 is shown as 550w.
And we can represent her up front and weekly costs over w weeks as:

Now, we need to know when:

Solving for w:

=>

w>12.85
Means w should be at least 13.
Hence, It will take a minimum of 13 weeks before Josephine makes a profit.