Answer:
The annual amortization expense for 2019 will be $35000.
Explanation:
The amortization expense for the patent calculated based on the useful life of patent. The purchase of value of $235000 plus $10000 gives the total value of $245000 while use the patent of 7 years.
The formula for amortization expense = (Cost of patent - Residual value ) / Useful life of patent)
amortization expense = ($245000-0)/7 = $35000
The legal life would not count due patent in business use for limited life compare to legal life of patent.