help with this working out group percentage

hi all i have worked out the individuals percentage loss no probs, but can not work out the groups overall percentage loss, can not open spread sheet as i dont have excel on computer can anyone please tell me the mathamatical way of working out the total percentage

thanks you

add all the wieghts before losses. eg 1200lbs
add all lbs lost. eg 21lb

then do the sum
21 divided by 1200 times 100 =1.75%

lbs lost divided by total weights times 100, that should give you the team %

thanks Susan

Have replied to your pm
Irene x