Question 11 4.7 pts At a sales level of $100,000, a firm has a degree of operating leverage of 10. This tells us that: O if sales volume falls by 10%, operating income will fall by 10% O if sales volume falls by 1%, operating income will fall by 1% o if sales volume falls by 10%, operating income will fall by 1% if sales volume rises by 10%, operating income will fall by 100% If sales volume falls by 1%, operating income will fall by 10%