Consider an air mass of temperature of 30°C and relative humidity 60% rising from sea surface (1000 mb) to 8 km in the (standard) atmosphere (pressure decreases with altitude approximately 100mb per kilometer, temperature lapse rate 6.5K km-?). Find the height of cloud-base where air temperature is equal to dew-point temperature. If the conversion efficiency of water vapor in the clouds to precipitation is 5%, and the convection lasts 2 hours with average updraft velocities of 1 m s', what would be the total precipitation?