Two brands of protective coating are considered. brand A cost 15.80$ per gallon. experience with brand a has revealed that it will cover 350 square feet of surface per gallon will give satisfactory service for 24 months and can be applied at the rate of 70 square feet per hour. brand B which cost 20.40$ per gallon is estimated to cover 400 square feet of surface per gallon and can be applied at the rate of 80 square feet per hour. the wage rate of the worker is 17$ per hour. if the nominal interest rate of 12% per year compounded monthly is used how many months should brand B last to provide service at equal cost with that provided by brand A? Assume 10000square feet are to be coated. Consider the cost of the material and cost of the labor in your calculations.