Someone at the home depot tells you that a 2 bolt is 6.75 times as heavy as a washer. what would be the mass of a box of such bolts

Equation 1 
weight of 2 bolt = 6.75 weight of washer
Equation 2
mass = W/g
Where
g = 9.8m/s^2
mass of  box of 2 bolt = weight of 2 bolt x 2 bolt pcs/box/9.8 m/s^2
mass of box of 2 bolt = 6.75 weightwasher x 2 bolt pcs/box
if there are 144 pcs of bolts/box
mass of box of 2 bolt= 6.75 weight of washer x 144/9.8m/s^2
mass of box of  2 bolt = 972 weight of washer /9.8m/s^2
                                      =99.18 weight of washer s^2/m