Karl has a mobile phone. Last month, he paid 12.8p for each minute of calls plus a monthly charge of £15.25.
Last month, Karl made 246 minutes of calls.
Work out the total amount that Karl paid last month.
Unless I've misunderstood the question:
You should multiply the 12.8p by the 246 minutes, that will give you the amount he paid for the minutes he used. Transfer the answer into pounds (making it easier to add up) and pence and then add that to £15.25. Doing this will give you the total amount paid.