Tally Corp sells software during the recruiting seasons. During the current year, 10,000 software packages were solid resulting in $470,000 of sales revenue, $130,000 of variable costs, and $48,000 of fixed costs. If sales increase by $80,000, operating income will increase by ____.(Round interim calculations of two decimal places and the final answer to the nearest whole dollar.) A. $32,000 B. $30,588 C. 57,872 D. $48,000