$60$ tons $(1$ ton $=2000$ lbm$)$ of coal were burned each day at Miami$$s steam plant. The ash made up approximately $10$ mass$\%$ of the coal. Assume that $40\%$ of the ash falls to the bottom of the boiler and is collected there as solid waste, and the rest is carried out of the boiler as particulate matter in the air stream. Then assume that $99\%$ of the particulate matter in the air stream was removed from the air stream in the electrostatic precipitator at the steam plant and disposed as solid waste. The mass flow rate of the particulate matter in the air stream that exits the steam plant is the emission rate of particulate matter.

Draw a box diagram of this process $($include a box for the boiler and the electrostatic precipitator$).$ Calculate the mass flow rate of ash entering and leaving each unit operation. What is the emission rate of ash, or particulate matter, from the steam plant when it burned coal? Put answer in terms of kg$/$day$.$