Growth rate = 4% = 0.04
Let.
Present Income = Y
So Double Income = 2Y
Time for it to double = n years
From Growth formula we know
So,
2Y = Y(1 + 0.04)n
2 = (1.04)n
Taking log on both sides :
log(2) = n * log(1.04)
n = log(2)/log(1.04) = 0.301/0.017
n = 17.7 years ~ 18 years
So, It will take around 18 years for the economy to double its income at growth of 4% per year.
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