Grommit Engineering expects to have net income next year of $$21\mathrm{.}04$ million and free cash flow of $$10\mathrm{.}52$ million.$$ Grommit's marginal corporate tax rate is $30\%.$

a$.$ If Grommit increases leverage so that its interest expense rises by $$7\mathrm{.}1$million$,$ how will net income$$ change?

b$.$ For the same increase in interest$$ expense, how will free cash flow$$ change?