Muscles 'R Us sells personal training services by the hour. The company's profit computation for last year is shown here: Sales revenue (1,000 hours @$45).. $45,000 Less: variable costs... -(15,000) Contribution Margin..... $30,000 Less: fixed costs. ...(10,000) Profit.. ...$ 20,000 Muscles has decided to increase the price of its services to $55 per hour. The company believes that if it increases its fixed advertising (selling) cost by $2,500 sales volume next year will be 1,800 hours. Variable cost per hour will be unchanged. How many hours of training would Muscles have to sell to earn as much profit next year as it did last year