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It's equal to 0.0000000015 percent. Think of this way: 15 parts per thousand is 15/1000 = 0.015 or 1.5 percent. 15 parts per million is 15/1E6 = 0.000015 or 0.0015 percent. 15 parts per billion is 15/1E9 = 0.000000015 or 0.0000015 percent. And 15 parts per trillion is 15/1E12 = 0.000000000015 or 0.0000000015 percent.

Q: How much is 15 parts per trillion?

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1,000,000,000,000,000 is a quadrillion in the US and a trillion in the UK and some parts of Europe.

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15,000,000,000,000 represents 15 trillion 5,000,000 represent 5 million Number of days to pay back 15 trillion at 5 million per day is (15000000000000)/(5000000) = 15000000/5 = 3000000 days That is roughly 3000000/365 = 8219.178 years (not including interest)

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