please explain

George and Helen must split the $1200 that they raise by fundraising together. George on his own could have raised $400. Helen on her own could have raised $600. According to the Shapley value, what is George's fair share of the $1200? $500. $400 $700. $800. $600. George and Helen must split the $1200 that they raise by fundraising together. George on his own could have raised $400. Helen on her own could have raised $600. According to the Shapley value, what is George's fair share of the $1200? $500. $400 $700. $800. $600