A hospital manager budgeted $100,000 for monthly nursing expenses in the hospitals well-baby clinic. The manager expected that the clinic would treat 5,000 babies and pay its nurses $40 per hour. Instead, the clinic treated 6,000 babies and used 3,200 hours of nursing time at $37.50 an hour. Calculate the total, quantity, price, and volume variances for nursing expenses during the month. Briefly explain your answers.