Answers:
The house's value decreased by $31,760
The current value is $365,240
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Work Shown:
8% of 397,000 = 0.08*397000 = 31,760 is the amount of lost value in the home. In other words, the value has dropped by this much.
The current value is 397,000-31,760 = 365,240
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If you didn't care about how much value was lost, and only cared about the current value, then you can take this slight shortcut
100% - 8% = 92%
92% of 397,000 = 0.92*397000 = 365,240
If the house lost 8% of its value, then it keeps the remaining 92% to be currently valued at $365,240
This shortcut is useful if you wanted to chain together many percentage increases or decreases together.