-21 increased by 12 is the same as -21 + 12, and this is equal to -9. A quick way of answering this is to subtract 12 from 21, then put a negative sign in front of it.
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28.5 increased by 12 is 40.5. 28.5 increased by 12% of itself is 31.92.
For 12: 4, 6, 12 For 21: 21
You can solve this by taking 12/21 and multiplying by 100. So, 12/21 = .571 * 100 = 57.1%
1.05
21-9 = 12