528
10% of 600 is 60, and 1% of 600 is 6. Doubling that latter amount gives us that 2% of 600 is 2*6 = 12. Add this to the 10% amount to get the 12% amount: 60 + 12 = 72. That's the amount that is subtracted from the original: 600 – 72 = 528.