Answer:
it will take 20.75 year to reach amount $20000
Step-by-step explanation:
It is given that average worker in China makes $5000 per year
So principal amount P = $5000
It is given that wage are keeping up with a rate of 7%
So rate of interest r = 7 %
We have to find the time in which amount will become $20000 per year
We know that total amount is given by
, here n is time period and r is rate of interest
So

So

Taking log both side


n = 20.75 year
So it will take 20.75 year to reach amount $20000