The letter

Level pending

A man writes a letter to four of his friends. He asks each one of them to copy the letter and mail to four different persons with the instructions that they move the chain similarly. Assuming that the chain is not broken and it costs 2$ to mail one letter, find the amount spent on postage when 8th set of letters is mailed. If your answer is for example 1234567 then you will write 1+2+3+4+5+6+7=28

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