Last year, Neptune Corporation had sales of $843,000 and paid taxes of $118,000. Because of the low interest rate environment, the firm also borrowed some money from the local bank and paid $68,000 in interest expense. In addition, the firm incurred Variable costs and Fixed Costs of $264,000 and $177,000 respectively. If sales increase by 5%, what should be the percentage change in operating income? SET YOUR CALCULATOR TO 4 DECIMAL PLACES AND ROUND TO 2 DECIMAL PLACES AT THE END. DO NOT ENTER THE % SIGN. IF YOUR ANSWER IS 7.7011%. FOR EXAMPLE, ENTER 7.70. 7.2