I would change the acne off of me.
I know it's simple to not get acne, but when you have it, you can't just wait a couple days and use medicine or stuff to prevent it, you gotta pick at it, and that hurts
The answer is for 3 months.
first you wanna multiply $12,000 by .03
then you see how many times that amount adds until you get your desired amount
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Chemical changes I think but also I think both but mostly chemical I think.
Hope it helps