Answer
The answer is below.
Work Step by Step
We know 0 Celsius is 273.15 degrees Kelvin. Thus:
$e_{water_{max}}=1 - \frac{273}{570}=52.1$%
We know 25 Celsius is 298.15 degrees Kelvin. Thus:
$e_{summer_{max}}=1 - \frac{298.5}{570}=47.6$%
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