Question About Earthquake Resinsurance for Financial Resources in Challenge MCT question

In the MCT challenge question, there are several components of the Financial Resources for the earthquake premium reserve, and one of them is the reinsurance section.

I presume that the calculation in the solution is based on the reinsurance coverage given:

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However in the calculation, I see this:

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Where 50 is used instead of 250. Is this by any chance a typo? If not, then what am I understanding wrong?

Thank you!

I think because the PML is 550M.

Nathan is right - the PML is 550