ANSWER
= $26
Step-by-step explanation
Since probably they all watched the same movie bought online so therefore they only used $19.
NUMBER OF PEOPLE IN ELLIE'S FAMILY
Parents i.e (mum and dad) = 2
Ellie (herself) = 1
Two sisters = 2
Therefore (2+2+1) = 5
TOTAL MONEY SPENT ON WAYCHING A MOVIE FROM THE THEATRE
= 5×$9
= $45
MONEY SAVED
= $45 - $19
= $26