Can someone please help? This is due soon and I have no clue how to do it. Someone please explain?

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?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

How are algebraic expressions evaluated using substitution?