$[$The following information applies to the questions displayed below.$]$

Oslo Company prepared the following contribution format income statement based on a sales volume of $1,000$ units $($the relevant range of production is $500$ units to $1,500$ units$)$:

Sales $ $95,000$

Variable expenses $57,000$

Contribution margin $38,000$

Fixed expenses $31,920$

Net operating income $ $6,080$

$13.$ Using the degree of operating leverage, what is the estimated percent increase in net operating income that would result from a $5\%$ increase in unit sales? $($Round your intermediate calculations and final answer to $2$ decimal places.$)$