The total sales made by a salesperson was $25,000 after 3 months and $68,000 after 23 months. Predict the total sales after 42 months.

25,000 / 3 = $8,333.33 per month

68,000 / 23 = $2,956.52 per month

There is too much difference between these monthly figures to attempt to predict sales after 42 months.

To predict the total sales after 42 months, we can first calculate the sales made per month.

Sales per month = (Total sales after 23 months - Total sales after 3 months) / (23 - 3)
Sales per month = ($68,000 - $25,000) / (23 - 3)
Sales per month = $43,000 / 20
Sales per month = $2,150

Now, we can use the sales per month value to predict the total sales after 42 months.

Total sales after 42 months = Total sales after 3 months + (Number of months * Sales per month)
Total sales after 42 months = $25,000 + (42 * $2,150)
Total sales after 42 months = $25,000 + $90,300
Total sales after 42 months = $115,300

Therefore, the predicted total sales after 42 months is $115,300.