Question

The percentage of tungsten in the Earth’s crust is 0.016%. How do I express this first as a fraction, and then as a proportion in ppm please?

Answer 1

Step 1

0.016% as a fraction = 16/1000

(16 with no 0 is written and then divided by 1000, the numbers of decimal figures)

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Step 2

0.016 % as

6 w