Natalie contacts her brother who originally prepared the website for her. he agrees to upgrade the site so it can handle credit card security issues as well as direct order entry. the cost of the upgrade is $1,800. this cost would be incurred and paid for during the month of august 2018, and the upgrade would be operational september 1, 2018. recall that natalie’s website had an original cost of $600 and is being amortized using the straight- line method over 24 months, starting december 1, 2017, with zero residual value. additional costs for website maintenance and insurance are estimated to be $1,200 per year. if natalie decides to upgrade the website, its useful life will not change and there will be no change in residual value. prepare the journal entry to record the upgrade.