Think of it this way. You have 5 apples. You eat 2. How many do you have left? Three. How? Well, you took away two from five, or you subtracted them (5-2) and got 3. We will do the same here.
If it’s the decimal places that confuse you, fear not. You subtract them just the same as you would normal numbers. I added a picture and labelled which numbers you subtract from which to make it easier if that’s the problem. Hope this helped.
The answer is $12.30 :)
