The correct answer is - 82.61%
Our planet is estimated to be 4.6 billion years old, while the first life on our planet has risen around 3.8 billion years ago. So we have a situation where 3.8 billion years of Earth's geological history it has been habitable. To get to the percentage and correct result we need to multiply 3.8 (billion) by 100 (the number of total percents), and than divide the result with 4.6 (billion).
3.8 x 100 = 380
380 / 4.6 = 82.61%
With 82.60% the Earth's total lifetime is habitable.
Earth is estimated to be 4.54 billion years old. The Scientists calculated calculated that the Earth is 4.54 billion years old by dating the rocks in Earth's ever-changing crust, as well as studying the rocks in Earth's neighbors, such as the moon and visiting meteorites.
The modern form of humans only evolved about 200,000 years ago. While our ancestors have been around for about six million years.
As our planet is estimated to be 4.6 billion years old and we also know that the first life on our planet has risen around 3.8 billion years ago. So it can be considered that, 3.8 billion years of Earth's geological history has been habitable.
So in order to get the percentage we need to multiply 3.8 (billion) by 100 (total percent), and then we need need to divide the result with 4.6 (billion) age of the Earth.
3.8 X 100 = 380
380 / 4.6 = 82.60%
Hence the answer was given and explained above.
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