Answer:
4
Step-by-step explanation:
The mean is the average of a data set. It can be found by adding up all of the values in a data set and then dividing it by the number of values in the data set.
The values in this data set;
The number of values in this data set,
Find the mean;
the answer is 9.315
$20500
26500-(.12*26500)=23320 For 1 year
23320-(.12*23320)=$20521.60 For 2 years