In one taxable year, a taxpayer purchases and installs the following: two exterior doors at a cost of $$1,000$ each, windows at total costs of $$2200$ and one central air coditionar at a costs $$5,000.$ All property installed meets credit. After applying the maximum limits for each of the improvements the taxpayer's total amount of energy efficient home improvement credit is what amount? A $$1200,$ B$$1800,$ C $$2900,$ $$3200$