Lol I love how you keep trying to insult me with "common core", "public education". Here's some napkin math for you:
10% of $10,000 is $1,000 therefore you have $9,000 left
10% of $100,000 is $10,000 and you're left with $90,000 (woe is me!)
Let's go farther. 10% of $1,000,000 is $100,000 and you're left with $900,000. Bless your poor soul the struggle must be terrible.