The steam requirements of a manufacturing facility are being met by a boiler whose rated heat input is 5.5 × 10⁶ Btu/h. The combustion efficiency of the boiler is measured to be 0.7 by a handheld flue gas analyzer. After tuning up the boiler, the combustion efficiency rises to 0.8. The boiler operates 4200 h a year intermittently. Taking the unit cost of energy to be $13/10⁶ Btu, determine the annual energy and cost savings as a result of tuning up the boiler.