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Get a ruler in your hands. Measure things until you start to understand how a ruler works. Measure some stuff and figure out where the center is. Say you measure a book and it's 7/8" thick. You look at your ruler and see that every eighth is divided into two sixteenths, so obviously half of 7/8" is going to be 7/16". If you write that out you have 1/2 x 7/8 = 7/16. And you notice that 1/2 is divided into 2/4 and then into 4/8 and so on, so you can convert anything to anything by multiplying all the numbers on top and then all the numbers on bottom.
Other rulers are divided into 10 and 100 parts. But an inch is still an inch, so anything on one ruler can be translated to the other ruler. A half inch on one ruler is 5/10 or 50/100 on the other. An eighth inch is just 12.5 marks when you have 100 marks per inch. A metric ruler divides an inch into 25.4 parts, so a half inch would be 12.7 of those parts. Pretty simple, isn't it? Practice this a bit and people will think you went to wizard school.
Percent is simply a ruler with 100 marks. The only confusion is trying to keep track of what the marks represent, since that changes from time to time. So you can see from this that 3% is the same as 0.03. It's important to remember that equality because you switchg back and forth between them.
If you invest A dollars at i percent, at the end of the first period you have T = A x (1+ i) which is to say the total account is the amount you have invested times 1 plus the interest. For the second period, that total becomes the new A and you do it again, so now you have T = A x (1 + i)^2. After the third period it becomes 3rd power, fourth period fourth power, and so on. So now we can write a general equation.
T = A x (1 + i)^n "Monthly for three years" makes n to be 36 periods.
$520 = A x (1.03)^36 The rule is you can do any valid operation on both sides of an equation and it will still be equal. Divide by (1.03)^36.
$520/(1.03)^36 = A Punch that into your calculator and there is your answer: $179.42
TIP: Spend five bux to get a business calculator so you can do these figures faster than you can say them. The calculator comes with a book that explains what it does similar to the way I have explained it here. Learn that information TOTALLY.