Widgets cost $$20/$unit to produce and are sold at $$40/$unit$.$ The firm has fixed operating costs of $$60,000.$ If the fixed operating costs are increased by $15\%,$ then what percentage increase in sales revenue is required to break even?

Question $5$Select one:

a$.$

$5\%$

b$.$

$10\%$

c$.$

$20\%$

d$.$

$30\%$

e$.$

$15\%$