The intensity (power per unit area) of the sunlight incident on Earth's surface, averaged over a 24-h

Question:

The intensity (power per unit area) of the sunlight incident on Earth's surface, averaged over a 24-h period, is about 0.20 kW/m2, If a solar power plant is to be built with an output capacity of 1.0 × 109 W, how big must the area of the solar energy collectors be for photocells operating at 20.0% efficiency?