Did you know?
Did you know that the cost of posting an inland letter is half the cost of posting an overseas letter? In this case, the cost of posting one inland letter is 5k, while the cost of posting one overseas letter is 10k.
Let's solve a problem to demonstrate this interesting fact: A messenger spent N1.20 in postage, consisting of 4 overseas letters and some inland letters. If we assume that the messenger only posted inland letters, each costing 5k, then the total cost of postage would have been 4 x 5k = 20k. However, the actual cost was only N1.20.
To find out how many inland letters the messenger posted, let's calculate the difference between the actual cost and the assumed cost of posting only inland letters: 20k - 1.20k = 18.80k.
Since the cost of posting an inland letter is 5k, we can divide the difference in costs by the cost of an inland letter to determine the number of inland letters posted: 18.80k รท 5k = 3.76 inland letters.
However, since we cannot have a fraction of an inland letter, we must round down to the nearest whole number. Therefore, the messenger must have posted 3 inland letters to account for the difference in postage costs.
This problem showcases the relationship between the costs of sending inland and overseas letters and can help us calculate the number of inland letters when given the total postage cost.
