I ' m not sure what you ' re asking . You have a list of . costs ? for specific periods . What is it ? What do you need with it ? weekly 27550 64 Okay , that ' s the sum of all the weekly amounts from your list . Bi Weekly 250100 153025710 69 What is this ? What ' s the 2 x 50 ? For the sum , 15 is the only biweekly item in the list . Where are the other figures coming from ? Monthly 167233457151515 57 The sum is clearer this time , as it ' s the montly items in the list . Still not sure what the 167 x 2 is . Bi Monthly 3342668 2010520 55 Same as above understandable sum of all the bimonthly items , plus a mysterious multiplication . Total every two months 1391 How ? Rounding to four weeks a month , I have for two months 64 x 8 69 x 4 57 x 2 55 957 .