She needs aid with translation.
I am pretty sure it is talking about interest and $640 is what you start with, with a 3% interest for 2 years
Answer and Step-by-step explanation:
If you see a number or fraction or anything we g beside it, such as:
4.2g
6g

^ That is grams
If you see anything with kg next to a number, fraction, e.t.c, such as

5kg
6.2kg
^ That is kilograms
Use the volume of a cylinder equation, V = pi*r^2*h to find the volume of the cylinder. To find the answer to the second one, find the volume of the square and subtract the volume of the cylinder from it.
You need to multiply the four numbers and then takeway