On July 1, 2009, Horrocks Engineering purchased a patent for $2,400,000. A 10-year useful life was estimated with no residual value. The straight-line amortization method is used. Early in 2012, the company determined that the patent would be useful for only five more years (2012–2016).

Required:

1. What type of accounting change is this?

2. Determine amortization expense for 2012.