Final answer:
The total cost of talking for 20 minutes on a cell phone with a rate of $0.15 per minute is $3.00.
Step-by-step explanation:
To calculate the total cost of talking for 20 minutes on a cell phone with a rate of $0.15 per minute, you can multiply the rate by the number of minutes.
0.15 x 20 = $3.00
Therefore, the total cost will be $3.00.