Susy sells authentic Amish quilts on her website. Suppose Susy expects to sell $1,400$ quilts during the coming year. Her average sales price per quilt is $$300,$ and her average cost per quilt is $$100.$ Her fixed expenses total $$210,000.$ Compute Susy's operating leverage factor at an expected sales level of $1,400$ quilts. If sales volume increases $10\%,$ by what percentage will her operating income change? Prove your answer by calculating operating income at a sales volume of $1,400$ and at a sales volume of $1,540.$

Compute her operating leverage factor. $($Round your answer to two decimal places.$)$

First, identify the formula, then compute the operating leverage factor.

$=$ Operating leverage factor