Find the height of a cylinder of 200 cm³ and radius 4cm

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 i been stuck on this question since yesterday

What is the product? a-3/15a × 5/a-3