A=bh, for b (an area formula)

If you are trying to make B the subject, you have to divide both sides by 'h' because  we need to get rid if 'h' to get 'b' on it's own, and you do the opposite of times - which is to divide. Once you divide both sides by h, you should end up with this: 

A/h=b

A. 50

Step-by-step explanation:

Simply multiply 9% and 578 to get your

578(0.09) = 52.02