xelsports had sales of $15,000 in January and $20,000 in February. The store has six full-time workers and each of them works 40 hours per week. In the month of January, the store also had five part-time workers and each of them worked 10 hours per week. In the month of February, the store also had six part-time workers and each of them worked 15 hours per week. Assume that there are four weeks in each month. Using sales dollars as the measure of output, what is the productivity for the month of January?