5: The following data relate to the overhead expenditure of a contract cleaners at two activity levels. Square metres cleaned Overheads 13,500 $84,865 15,500 $97,015 15,950 $97,850 What is the estimate of the overheads if 17,000 square metres are to be cleaned if the total fixed costs are expected to increase by $1,000 when the square metres cleaned exceed 16,000 m? (Show your working)