Answer:
$299,280
Step-by-step explanation:
If the Tolstoys purchased the house they would pay on average $120 per sq ft x 2,900 sq ft = $348,000
If Mr. installs the plumbing and Mrs. Tolstoy decorates the house, they can save 10% (plumbing and installing plumbing fixtures) and 4% (interior decorating) = 14% of the cost
So the Tolstoys can save = $348,000 x 14% = $48,720
the cost of the house = $348,000 - $48,720 = $299,280