Exercise 10-9 Changing the useful life of Jacoby Legal Services purchased land and a building for $1,100,000. The land had a fair operty, plant, and equipment value of $300,000 and the building $800,000. The building was amortized on a straight- line basis over a 50-year period. The estimated residual value was $50,000. After using the for Yeat 21building for 20 years, the company realized that wear and tear on the building would force $25.000 the company to replace it before 50 years. Starting with the 21st year, the company began amortizing the building over a revised total life of 40 years with zero residual value. Record amortization expense on the building for years 20 and 21