Assume the cost of house, when it was built be $ x
Today its cost 36 % more = x+x*(36/100)
Given its cost today = $333200
x+x*(36/100)=333200
x+(36x/100)=333200
(100x+36x)/100=33200
136x/100=333200
136x=333200*100
x=33320000/136
Therefore, the cost of house, when it was built be $245,000.