Lakeside Lumber Company incurs a cost of \($450\) per hundred board feet in processing certain “rough-cut” lumber, which it sells for \($600\) per hundred board feet. An alternative is to produce a finished-cut” at a total processing cost of

\($560\) per hundred board feet, which can be sold for \($850\) per hundred board feet. For these alternatives, what is the amount of

(a) the. differential revenue,

(b) differential cost, and

(c) differential income?