While performing a leak off test the surface pressure at leak off was 1000 psi. The casing shoe was at a true vertical depth of 5000 ft and a mud...

1.    While performing a leak off test the surface pressure at leak off was 1000 psi. The casing shoe was at a true vertical depth of 5000 ft and a mud weight of 10 ppg was used to conduct the test. What is the maximum allowable mud weight at this depth if we consider a safety factor of 0.5 ppg.