The variable cost for $A$ is $$10,$ and for $B,$$$14.$ The revenue generated by each unit is $$18.$

a$)$ What is the crossover point for the two options?

The crossover point for the two options is $7750$ units. $($Round your response to the nearest whole number.$)$

b$)$ At an expected volume of $8,300$ units, which alternative should be chosen?

The profit $($loss$)$ if proposal A is accepted and $8,300$ units are produced is $$.($Round your response to the nearest dollar and include a minus sign if necessary.$)$