*This worksheet is used for illustration purposes only, and is not a guarantee of said results. Individual results may vary. This calculates the profit-improvement potential that contractors may realize when they switch to IKO's Dynasty or Cambridge shingle - which provides 100 sq. ft. of coverage per three bundles. NOTE: Assumptions used in the calculator are based on website or literature published by competitors as of June 2013, and are subject to change without notification. The calculation information is subject to change without notification. IKO assumes no responsibility for errors that may appear in the calculation.