Define "incremental cash flow."$1.$a$.$ Should you subtract interest expense or dividends when calculating project cash flow?$1.$b$.$ Suppose the firm had spent $$100,000$ last year to rehabilitate the production line site. Should this cost be included in the analysis? Explain$\mathrm{.}1.$c$.$Now assume that the plant space could be leased out to another firm at $$25,000$ per year.Should this be included in the analysis? If so$,$ how?$1.$d$.$ Finally, assume that the new product line is expected to decrease sales of the firm's other lines by $$50,000$ per year. Should this be considered in the analysis? If so$,$ how?