Using a computer spreadsheet you have written, and the data in Problem 11–26, determine the daily and annual sludge production at the following removal efficiencies: 40%, 45%, 50%, 55%, 60%, and 65%. Plot annual sludge production as a function of efficiency

Answer 1

I do not have any such spreadsheet.
Graph
efficiency on x axis
annual sludge produced as y values.

By the way, if your efficiency is 40% what happens to the other 60%?
Is it used to fertilize Romaine lettuce in Arizona?