A community plans to build a facility to convert solar radiation to electrical power. They require 0.7 MW of power, and the system to be installed has an efficiency of 14% (that is, 14% of the solar energy incident on the surface is converted to electrical energy). What must be the effective area of a perfectly absorbing surface used in such an installation, assuming a constant power per unit area of 1356 W/m^2 in the incident solar radiation?