answer to previous question is 58. please help calculate.

here is the previous question with answer

(58 Canadian Drugs.com was selling 20 mg. of Crestor for about $2.00 (US) per pill. First, compute the cost of treating 10,000 persons with a 20 mg. Crestor pill each day for one year. Then, using your answer for the previous question, what would be the annual cost to prevent one (1) major heart attack in a group of 10,000 people with elevated C-reactive protein? Round off your answer to the nearest $1,000 and submit just the number of dollars (without the $ sign or any commas). Group Crestor (statin) Placebo Subjects 8,901 8,901 Major Cardiac Events - 142 Person-years 18,442 18,529 251 Using the data from the table above from the Crestor trial, calculate the incidence rate difference for daily use of Crestor compared to placebo. To the nearest whole person, how many fewer major cardiac events would there be in persons using Crestor for a total of 10.000 person-vears. Enter just the number of people without units. 58 Using the data from the table above from the Crestor trial, calculate the incidence rate difference for daily use of Crestor compared to placebo. To the nearest whole person, how many fewer major cardiac events would there be in persons using Crestor for a total of 10.000 person-vears. Enter just the number of people without units. 58 Incidence difference = 251/8901 - 142/8901 = 0.012245 142/18442 * 10000 = 76.9982 251/18529 * 10000 = 135.46 difference = 135.46 - 76.99 = 58.47 = 58