A factory that manufactures and sells computers hard drives pays $2200 per month for rent and utilities , and $10,500 per month for management salaries. The variable costs are $ 55 per unit, and each hard drive sells for $415

a)What salesvolume(that is, the number of hard drives), per month, is required to break even?

b) Whatvolume(that is, the number of hard drives), per month, is required to generate a net income of$325,000?