How do i find the scale factor?

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

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?