Sheridan Shacks makes portable garden sheds that sell for $1,800 each. Costs are as follows: a. How many garden sheds must the company sell to break even? b. If Sheridan Shacks’ management wants to earn a pre-tax profit of $200,000, how many garden sheds must it sell? c. If Sheridan Shacks’ management wants to earn a pre-tax profit of $280,000, how many garden sheds must itsell?