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As of 10:15 today (16/02/2012)- 20 USD = 1,576.39 JPY - according to the currency web-site Xe - See related link.
Next power of 10 after 10 000 is 100 000.
I'm guessing that is: (70 000 000)² = (7×10^7)^2 = (7×10^7) × (7×10^7) = (7×7)×(10^7 × 10^7) = (7×7)×10^(7+7) = 49×10^14 = 4 900 000 000 000 000
1 billionth = 10-9 (1 billionth)4 = (10-9)4 = 10-36 That's 0.000 000 000 000 000 000 000 000 000 000 000 001
2.3*10^10