Can anyone explain how to solve these problems?

The refrigerator's coefficient of performance is 3.81.
The refrigerator's power input is 504 W.
The refrigerators coefficient of performance is calculated as follows;
[tex]COP = \frac{T_{cold}}{T_{hot} - T_{cold}}[/tex]
[tex]COP = \frac{202}{255 - 202} \\\\COP = 3.81[/tex]
[tex]W = P \Delta V = P (V_2 - V_1)\\\\W = 150 \times 10^3 (100 \times 10^{-6} \ - \ 40 \times 10^{-6})\\\\W = 9 \ J[/tex]
[tex]P = \frac{E}{t} \\\\P = 9 \ J \ \ \times \ \ 56 \ \frac{cycle}{s} \\\\P = 504 \ J/s \ = \ 504 \ W[/tex]
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