A silicon abrupt junction has doping of na1016cm3 and

Question

Please compute the right answer of the following Problem

Problem- A silicon abrupt junction has doping of Na=1016/cm3 and Nd=1015/cm³. At T = 300 K, and zero bias, calculate built-in potential Vbi, xn , xp and total depletion region.

Part 1- Calculate the electric field at x =0.

Part 2-What percentage of W is the p=depletion region?

I need experts assist to find the electric field at given point.