You are trying to figure out his pay every two months. What you need to do is take the money he earns -$27,800- and divide it by 12. You divide it by 12 because of the 12 months in the year. So $27,800/12=$2316.67. You then take $2316.67 and add another $2316.67 so it totals up to two months. So $2316.67+$2316.67= $4633.34. Hope this helps!