Monopoly Sudoku - Mariachi Festival

Hello,

The badge is to achieve 300,000 monopoly dollars from filling puzzle cells before the event ends.

I have been playing, and the math just doesn't seem right.  If I win 7 or 8 thousands monopoly dollars, it's not adding correctly.  At this rate, I will never reach 300,000.

Please advise.

Thanks!

arsun51