my idea,
 
say, fruit1 is required to make person A and person B happy.
 
person A requires num1 number of fruit1 and person B requires num2 number of fruit1.
 
then required number of fruit1 is max( num1 , num2 )
 
similary if you can extend this to all who require it and calculate the max requirement for the fruit.
 
i.e  max ( num1 , num2 , num3 , num4 .... numn )
 
cost involved in buying a fruit is ( maxrequirement for the fruit * cost of one fruit ).
 
sum of all such costs for all fruits is the answer.
 
hope this helps.
 
Thanks,
Arun.
 

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