Answer:
$12000
Explanation:
If the house sold with a profit of 15%, then this means it sold for 115% of its original price (100 + 15 = 115).
Convert 115% into a decimal: 115% = 115/100 = 1.15
Divide 13800 by 1.15 to find the original price: 13800 ÷ 1.15 = 12000