5. A patient cuts 100-mg scored tablets to take his 50-mg prescribed daily dose. A prescription for thirty 100-mg tablets costs $45, and a prescription for thirty 50-mg tablets costs $40. The patient asked the pharmacist to weigh an uncut tablet on an electronic balance into two "halves." The uncut tablet was found to weigh 240 mg, and the cut "halves" weighed 125 mg and 115 mg, respectively. (a) How much money did the patient save on a monthly basis by dosing with half tablets? (b) What was the percentage error in the weight of the cut tablets com- pared with "exact halves"?