Assume that gasoline costs $$3\mathrm{.}65$ per gallon and you plan to keep either car for six years. How many miles per year would you need to drive to make the decision to buy the hybrid worthwhile, ignoring the time value of money? $($Do not round intermediate calculations and round your answer to nearest whole number, e$.$g$.,32.)$

b$.$ If you drive $16,000$ miles per year and keep either car for six years, what price per gallon would make the decision to buy the hybrid worthwhile, ignoring the time value of money? $($Do not round intermediate calculations and round your answer to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$