Without delay, let's solve this. We've got 750 and we will be multiplying it by 4, that is, adding 750 to itself 4 times.
Step 1: 0 + 750 = 750
Step 2: 750 + 750 = 1500
Step 3: 1500 + 750 = 2250
Step 4: 2250 + 750 = 3000

So, 750*4 = 3000