OK, let's crack this. We're given 500 and our task is to multiply it by 4. Essentially, we'll be adding 500 to itself 4 times.
Step 1: 0 + 500 = 500
Step 2: 500 + 500 = 1000
Step 3: 1000 + 500 = 1500
Step 4: 1500 + 500 = 2000

So, 500*4 = 2000