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"I crunched the numbers. Buying 100 computers will cost over $50,000. Renting a place might run $5,000 or $6,000 a month. Adding everything up, around $70,000 should cover it," Liu Chao said after calculating the costs. "A hundred computers at $2 an hour means each one makes $48 a day. So 100 computers bring in $4,800 daily. Over a year, that's over a million. After costs