Hydro Systems Engineering Associates, Inc., provides consulting services to city water authorities. The consulting firms contribution-margin ratio is 15 percent, and its annual fixed expenses are $285,000. The firms income-tax rate is 30 percent. Required: 1. Calculate the firms break-even volume of service revenue. 2. How much before-tax income must the firm earn to make an after-tax net income of $154,000? 3. What level of revenue for consulting services must the firm generate to earn an after-tax net income of $154,000? 4. Suppose the firms income-tax rate changes to 20 percent. What will happen to the break-even level of consulting service revenue?