Define the exponential function
where A is the hourly wage.
Given that A(0) = 7.50 and A(10) = 12.22.
By using definition of A(t),
Then
Now, use A(10)=12.22.
Take logarithm on both sides.
Substitute the value of r in A(t).
Find the wage after 10 more years.
Take t = 20 and substitute into A(t).
In 20 years, the daily wage will be $19.904.