i cant figure out this managerial accounting practice problem

Required information A company sold a total of 1,000 units for total sales revenue of $60,000 The company incurred total variable expenses of $39,000 and total fixed expenses of $ 14.700. Based on this, the company reported a total contribution margin of $21.000 and net operating income of $ 6,300. Use this information to answer the following questions. Assume that all units are within the relevant range. Calculate the estimated percent increase in net operating income for a 5% increase in sales. (Hint: Use the degree of operating leverage you already computed.) (Round your intermediate calculations and final answer to 2 decimal places.) Increase in net operating income