Calculate the amount of acceptor dopant (Boron) that is needed to prepare 100kg of p-doped silicon. Density of silicon is 2.5 g/cm³, and atomic weight of silicon is 28 g. Atomic weight of B is 10 gram. Avogadros number is 6.02x10²³.

c) Design a solar fast-charging station with 500 V and 200A output to charge 20 battery packs of electric vehicles within 10-hour of operation. Assume the average energy of each battery pack as 50kWh. The solar charging station is made of solar panels with 20V and 10A output. Report how many solar panels are needed, and how they are connected in terms of series and parallel connections.