The company reserves the right to revise the functions and duties of the job or to require that additional or different tasks be performed when circumstances change (i.e., emergencies, changes in personnel, work load, rush jobs, or technological developments). Ability to add, subtract, multiply, and divide in all units of measure, using whole numbers, common fractions, and decimals as well as calculate figures and amounts such as discounts, interest, commissions, proportions, and percentages.