book Maths Puzzle Numerical Ability

A home purchased for $300,000 depreciated 8% over a 1-year period. What was the value of the home after at the end of the year?

Would someone help me out on this one i am stuck...thanks so much

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I need help with a problem like this

c=2(3.14)r;r
Use cramers rule to solve

2x+3y+z=0
5x+y-2z=9
10x-5y+3z=4