The percentage of the incoming solar radiation reflected back to space by the earth is:
Show Hint
Albedo values range from 0 (perfect absorber) to 1 (perfect reflector).
Fresh snow has an extremely high albedo ($\approx 0.8$ to $0.9$), while ocean surfaces have a very low albedo ($\approx 0.06$). The global average is about 0.3 (or 30%).