The incidence rate should be calculated by dividing the number of cases by the number of population at risk.
1. There are 13,963,753 males that have the risk of developing prostate cancer. There are 20,734 cases of prostate cancer found in 2012.
Then, the incidence rate of prostate cancer would be: 20,734/ 13,963,753= 0.148%= 148 case per 100,000 population
2. I will assume that the population that at risk of breast cancer is only female to solve this question(it is possible for men to develop breast cancer in real life).
There are 14,272,325 females that have the risk of developing female breast cancer. There are 19,107 cases of female breast cancer found in 2012.
Then, the incidence rate of the breast cancer would be: 19,107 / 14,272,325= 0.133% = 133 case per 100,000 population