In a simple model of Earth's oceans, the upper layer of water that is well mixed by waves, wind, and heating by sunlight is about 500 m deep. This layer sits on a deeper layer of colder water beneath it. The area of the upper layer is about 3.60e+08 km2 and its average temperature is currently about 17 °C. Suppose that the temperature of this upper layer is increased to 19.2 °C. (a) By how much will the volume of this layer increase?