Cal pays his employees weekly. He would like to start paying then four times the weekly amount on a monthly basis. Is the equivalent to four weeks?

No, four weeks is not equivalent to a month in terms of exact number of days. One month typically has around 30 to 31 days, while four weeks is exactly 28 days. To ensure accurate monthly payments, Cal would need to calculate the total number of working days in a month and multiply his employees' weekly amount by that number.