Answer:
11.63 million dollar
Explanation:
In 2005 the construction cost index was 1746 , in 2015 , it was 3260.
change in index in 10 years = 3260-1746 = 1514
change in 5 years ( estimated ) = 757
Estimated index in 2010 = 1746 + 757
= 2503
Estimated index in 2020 = 3260 + 757
= 4017
Value of building in 2010 = 1746 million dollar
Value of similar building - X
X / 1746 = index in 2020 (probable ) / index in 2010
X / 7.25 = 4017 / 2503
X = 11.63 million dollar