Without delay, let's solve this. We've got 800 and we will be multiplying it by 3, that is, adding 800 to itself 3 times.
Step 1: 0 + 800 = 800
Step 2: 800 + 800 = 1600
Step 3: 1600 + 800 = 2400

So, 800*3 = 2400