Answer:
a) 6 dollar per ticked
b) from 25 to 35 the young adult will be charged with a higher price whilethe other groups, elderly, teenagers and children with a minimum price of 6
Explanation:
Erin    $  6   9
Grace  $  9  14
David   $  7  16
Charlie $ Â 6 Â 45
Allison $ Â 8 Â 66
Franco  $ 10 28
Becky  $  11  34
a) the max revenue comes from charging 6 dollar per ticket:
7 people x 6 dollar = 42 dollars
if we charge more like seven dollar then, we lose two customer and we don't make up for that lose:
5 people x 7 dollars = 35 dollars
b) the young-adult group will be the target to price discrimination they will be charged with 10 dollars if the cinema could do it.