The Hampshire Company manufactures umbrellas that sell for $12.50 each. In 2014, the company made and sold 60,000 umbrellas. The company had fixed manufacturing costs of $216,000. It also had fixed costs for administration of $79,525. The per-unit costs of each umbrella are as follows:

Direct Materials: $3.00

Direct Labor: $1.50

Variable Manufacturing Overhead: $0.40

Variable Selling Expenses: $1.10

Calculate the degree of operating leverage. Assume that sales will increase by 20% in 2015. Calculate the percentage of before-tax income for this increase. Provide calculations to prove that your percentage increase is correct based on the operating leverage calculated