Because Murray broke the classroom TV, he is forced to get a job to earn money so he can have $6000 for a new TV. BTW, Neutrina and Lucy are look alikes of Adrianna.
Murray's dad: Murray, get downstairs.
Murray: What is it?
Murray's dad: Principal Twilight Sparkle called me and she told me that you need a job.
Murray's dad: You broke the classroom TV the other day. It cost $6000 and now you have to work to buy a new one.
(at The Salvation Army Thrift Store)
Boss: Hello, you must be Murray Benjamin Robinson.
Murray: I am.
Boss: I heard that you are working here just to earn money for a new classroom TV. How much money would you like to earn?
Boss: I'm afraid every day, you earn $100. Every week you earn $500.
Murray: That means I work for you six weeks.
Lucy: I agree with Neutrina.
Boss: Lucy and Neutrina, get out of here!
Boss: Because you two can't fool Andrew by looking like his girlfriend Adrianna!
(12 weeks later)
Murray's dad: How was your work day?
Murray: It was good.
Murray's dad: I forgot to tell you that you still need to go to the store and buy a new TV for your school.
This is the sequel to Murray Breaks the Classroom TV.