36
----
100
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2,200 x .036 (3.6%) = 79.2
815 036 000 is 184, 964, 000 off from 1 billion. I checked the answer so it is correct. If you want to click the sceptical emoji try it out.
Every fraction is an equivalent fraction: each fraction in decimal form has an equivalent rational fraction as well as an equivalent percentage fraction.
A fraction that has a different sign to the first fraction.
Divide the fraction by 100, and you will get the percentage of a fraction.