Answer:
$40.
Input: Number of days,
Output: Money earned.
Explanation:
We have been given that Alex mows two lawns per day and earns $10 per lawn.
The amount earned for mowing lawns per day would be 2 times $10:

Since Alex earns $20 per day, so amount earned from lawn mowing in two days would be 2 times $20.


Therefore, Alex will earn $40 in two days.
The input for the given scenario is number of days spent on mowing lawns.
The out-put is amount earned from mowing lawns.