Answer:
The best use is the duplex
Step-by-step explanation:
The first possible use value, as a single home, is already given in the question: $155.000.
For the retail site, we have $60,000 per acre and 2.4 acres:
$60,000 x 2 + $60,000 x 0.4
=$144,000
A duplex has two units, and the value is $85,000 per unit:
$85,000 x 2 = $170,000
Therefore, the duplex gives the highest possible value of use to the 2.4 acres.