A person sends a message to four friends. He asks each of them to forward the same to four more friends. With the same instruction, the chain is moved forward. If one message is 50 paise and the chain is not broken, find the amount spent on sending the SMS when the 8th set of SMS is sent.
10th
10th
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1set=50*4=200paise
8set=200*8=1600paise=16rupees