Need answer ASAP!!! Dont have to explain too much once the correct answer is provided.

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Last year, Neptune Corporation had sales of $877,000 and paid taxes of $111,000. Because of the low interest rate environment, the firm also borrowed some money from the local bank and paid $62,000 in interest expense. In addition, the firm incurred Variable Costs and Fixed Costs of $271,000 and $115,000 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. Neptune Corporation's bonds have 20 years to maturity with a coupon rate of 10%. Interest is paid semi-annually. The bonds sold at par value, but the firm paid flotation costs amounting to 5% of par value. The firm has a marginal tax rate of 21%. What is the firm's after-tax cost of debt for these bonds? O 10.61% O 5.98% 08.38% O 4.99% O 5.85%