What is the total cost of posting 12 letters at 5 kobo each and four letters at 18k each?
The total cost of posting 12 letters at 5 kobo each is 12 * 5 = <<12*5=60>>60 kobo.
The total cost of posting four letters at 18k each is 4 * 18 = <<4*18=72>>72 kobo.
Therefore, the total cost of posting all the letters is 60 + 72 = <<60+72=132>>132 kobo. Answer: \boxed{132}.
To calculate the total cost of posting 12 letters at 5 kobo each and four letters at 18 kobo each, you need to multiply the number of letters by the cost per letter, and then add up the costs.
First, let's calculate the cost of posting 12 letters at 5 kobo each:
12 letters * 5 kobo per letter = 60 kobo
Next, let's calculate the cost of posting four letters at 18 kobo each:
4 letters * 18 kobo per letter = 72 kobo
Now, to get the total cost, add the two costs together:
60 kobo + 72 kobo = 132 kobo
Therefore, the total cost of posting 12 letters at 5 kobo each and four letters at 18 kobo each is 132 kobo.
To calculate the total cost, we need to find the cost of posting 12 letters at 5 kobo each and the cost of posting 4 letters at 18 kobo each, and then add them together.
For 12 letters at 5 kobo each:
Cost of posting 1 letter = 5 kobo
Cost of posting 12 letters = 5 kobo x 12
Cost of posting 12 letters = 60 kobo
For 4 letters at 18 kobo each:
Cost of posting 1 letter = 18 kobo
Cost of posting 4 letters = 18 kobo x 4
Cost of posting 4 letters = 72 kobo
Now, we can add the two costs together to find the total cost:
Total cost = Cost of posting 12 letters + Cost of posting 4 letters
Total cost = 60 kobo + 72 kobo
Total cost = 132 kobo
Therefore, the total cost of posting 12 letters at 5 kobo each and four letters at 18 kobo each is 132 kobo.