A boy sent a telegram which contains 36 words to his mother. If the first 12 words cost 20k and each additional word costs 2k per word, how much did he pay?
The boy sent a telegram with 12 + 36 - 12 = <<12+36-12=36>>36 - 12 = <<12+36-12=36>>36 - 12 = 36 words.
The cost for additional words is 36 - 12 = <<36-12=24>>24 words.
The additional words cost 24 x 2k = <<24*2=48>>48k.
Therefore, the boy paid 20k + 48k = <<20+48=68>>68k. Answer: \boxed{68}.
The first 12 words cost 20k.
The remaining words in the telegram, which is (36 - 12) = 24 words, cost an additional 2k per word.
So, the additional cost for the remaining words is 24 x 2k = <<24*2=48>>48k.
Therefore, the total cost for the telegram is 20k + 48k = <<20+48=68>>68k.
Therefore, the boy paid 68k for the telegram.
To find out how much the boy paid for the telegram, we need to calculate the cost of the additional words beyond the first 12.
First, we need to determine how many additional words were sent in the telegram. The total number of words in the telegram is 36, and the first 12 words already cost 20k.
So, the number of additional words in the telegram would be:
Additional words = Total words - First 12 words
Additional words = 36 - 12
Additional words = 24
Now that we know the number of additional words, we can calculate the cost for these words. Each additional word costs 2k per word.
Cost of additional words = Additional words × Cost per word
Cost of additional words = 24 × 2k = 48k
Finally, to find the total cost of the telegram, we need to add the cost of the first 12 words to the cost of the additional words:
Total cost = Cost of first 12 words + Cost of additional words
Total cost = 20k + 48k = 68k
Therefore, the boy paid 68k for the telegram.