Wild-Water Works Water Park provides for a fun day by offering a variety of rides. Wild-Water Works Water Park sells tickets at $73 per person as a one-day entrance fee. Variable costs per person are $33 and fixed cost amount to $136,000 per month. Wild-Water Works Water Park expects to sell 6,900 tickets. Estimate the operating income if sales increase by 15%. Calculate the degree of operating leverage. (Round your answers to two decimal places when needed and use rounded answers for all future calculations.)