The cost of posting one inland letter is 5k and one overseas letter is 10k. A messenger spent N1.20 in posting 4 overseas letters and some inland letters. How many inland letters did he post?

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Answer 1

Cost of 4 overseas letters = 4 x 10k = 40k

Remaining cost = N1.20 - 40k = 80k

Cost of 1 inland letter = 5k

Number of inland letters = 80k / 5k = 16