If the charge for an external telegram is 6 naira for first ten words and then 45k per word for each additional word, what is the cost of a telegram of 15 words?
The first 10 words cost 6 naira.
The remaining 5 words cost 5 x 45k = 225k.
225k is equivalent to 0.225 naira.
Therefore, the total cost of the telegram is 6 + 0.225 = 6.225 naira. Answer: \boxed{6.225}.
To calculate the cost of a telegram of 15 words, we need to determine the cost of the first 10 words and then the cost of the additional 5 words.
Step 1: Calculate the cost of the first 10 words.
The charge for the first 10 words is 6 naira.
Step 2: Calculate the cost of the additional 5 words.
The charge per word for each additional word is 45k (0.45 naira).
So, the cost of the additional 5 words is: 5 words * 0.45 naira/word = 2.25 naira
Now, we can calculate the total cost of the telegram:
Total cost = Cost of the first 10 words + Cost of the additional 5 words
Total cost = 6 naira + 2.25 naira = 8.25 naira
Therefore, the cost of a telegram of 15 words would be 8.25 naira.
To calculate the cost of a telegram of 15 words using the given charge structure, we need to determine the number of additional words beyond the first ten.
Step 1: Find the number of additional words
The given telegram has a total of 15 words. Since the first ten words are charged at a flat rate, the number of additional words is 15 - 10 = 5.
Step 2: Calculate the cost of the additional words
The charge for each additional word is given as 45k. Therefore, the cost of the additional words is 5 * 45k = 225k.
Step 3: Calculate the total cost
The cost of the first ten words is given as 6 naira. Adding the cost of the additional words, the total cost of the telegram is 6 naira + 225k = 6 naira + 0.225 naira = 6.225 naira.
Therefore, the cost of a telegram of 15 words is 6.225 naira.