Amortization Expense

For each of the following unrelated situations, calculate the annual amortization expense and prepare a journal entry to record the expense:

a$.$ A patent with a $15-$year remaining legal life was purchased for $$670,600.$ The patent will be commercially exploitable for another seven years.

b$.$ A patent was acquired on a device designed by a production worker. Although the cost of the patent to date consisted of $$141,840$ in legal fees for handling the patent application, the patent should be commercially valuable during its entire remaining legal life of $18$ years and is currently worth $$900,000.$

c$.$ A franchise granting exclusive distribution rights for a new wind turbine within a three$-$state area for four years was obtained at a cost of $$83,200.$ Satisfactory sales performance over the four years permits renewal of the franchise for another four years $($at an additional cost determined at renewal$).$

$\backslash$table$[[$General Journal$],[$Ref$.,$Description,Debit,Gredit$],[$a$.,$hat$(),,],[,$hat$(),,],[,$To record patent amortization.,,$],[$b$.,$hat$(),,],[,,,],[,$To record patent amortization.,,$],[$c$.,$hat$(),,],[,$hat$(),,],[6,$To record franchise amortization.,,$]]$