A central-receiver solar thermal powerplant uses 1000 heliostats that have 50 m2 of reflecting surface each. The steam plant has an overall efficiency of 27% and generates 3.0 MW peak power. Using a reasonable solar energy insolation on the heliostats on a clear sunny day, estimate (a) the overall efficiency of the solar powerplant and (b) the efficiency of energy transmission to the steam in the central receiver, both at peak conditions. Assume a reasonable I is 1.0 kW/m2.