Using the fact that the additional storage overhead is the sum of an infinite geometric series where the ratio of the series is 1/4, i.e. S = (1/4) + (1/4)^2 + (1/4)^3 ... we have S = 1/3. So the additional overhead is 1/3.

Using the fact that the additional storage overhead is the sum of an infinite geometric series where the ratio of the series is 1/4, i.e. S = (1/4) + (1/4)^2 + (1/4)^3 ... we have S = 1/3. So the additional overhead is 1/3.