HELP giving brainiest I attached the question its multiplying exponents

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

Find the cosine function that is represented in the graph.