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Telephone charges

Threads: Write a program for telephone charges for a household with the following parameters:

  • Mandatory subscription fee is 25 thousand.
  • 600 for each call contract 50 first minute.
  • 400 copper per minute call 150 The next minute.
  • 200 VND per minute for any later 200 first minute.

Input: A single integer is the number of call minutes
Output: The words: “So tien = x”, where x is the amount payable.

For example:

input: 
1
output:
So ten = 25600

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