(0 .with-salary .total ..)
(# with-salary (% 
                   weeks .x
               ) 
               (@ row +-
                   (row.with-salary .with-salary)
               )
)
(# total (% 
             weeks .x
         ) 
         (@ row +-
             (row.total .total)
         )
)
(say <- ((/ total) with-salary) # '0.00')