What is the doubling time of prices which are increasing by
What is the doubling time of prices which are increasing by 4 percent per year?
 
doubling time = ________ (include units)
doubling time = ________ (include units)
Solution
A = P(1+r/100)n
 Hence in this case we have A = 2P; r = 4
 Hence : 2 = (1+4/100)n
 Or log (2) = nlog(1.04)
 n = log(2)/log(1.04) = 17.6729877 years

