What was the operating leverage factor?

Using Harrah Company: If the sales revenues increase by 15%, what will be the percentage increase in income before income taxes?

 

Harrah Company produced and sold 45,000 units of a single product last year, with the following results: Sales revenue Manufacturing costs: Variable Fixed Selling costs: Variable Fixed Administrative costs: Variable Fixed P1,350,000 585,000 270,000 40,500 54,000 184,500 108,000