Gluon Incorporated is considering the purchase of a new high pressure glueball. It can purchase the glueball for $$50,000$ and sell its old low$-$pressure glueball, which is fully depreciated, for $$8,000.$ The new equipment has a $10-$year useful life and will save $$12,000$ a year in expenses before tax. The opportunity cost of capital is $10\%,$ and the firm$$s tax rate is $21\%.$ What is the equivalent annual saving from the purchase if Gluon can depreciate $100\%$ of the investment immediately.