First figure out how much money Nigella earned from commission by subtracting her base salary from her total earnings: $8,000 - $3,000 = $<<8000-3000=5000>>5,000.
Next, figure out how much all three houses cost by dividing Nigella's commission money by her commission rate: $5,000 ÷ 0.02 = $<<5000/0.02=250000>>250,000.
Next, express each house's price in terms of A's price: B = 3A, and C = 2A - $110,000.
Now we know that A + 3A + 2A - $110,000 = $250,000.
We can combine like terms to find that 6A - $110,000 = $250,000.
Now we add $110,000 to both sides of the equation and get 6A = $360,000.
We can divide both sides by 6 to find A = $60,000.
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