Given:
The function is:

Where y is the sales of lawn mowers t years after a particular model is introduced.
To find:
How many mowers will be sold 3 years after a model is introduced?
Solution:
We have,

Substituting
, we get



On substituting the approximate value of ln(31), we get



Therefore, the 18887 mowers will be sold 3 years after a model is introduced.