Hey once again !
I will explain you how to get the answer...
What I did is multiply $21,500 times 30 = $645,000
Then I multiplied $65,470 times 30 = $1,964,100
After I had multiplied, I subtracted the results.
$645,000 - $1,964,100 = $1,319,100
So the difference is $1,319,100
I hope I was able to help you out ! :D