Question 349816
Let x = the original number. 



If you have a 16% increase, then you're basically adding 16% of that original number to the original number. 



In other words: 16% increase of some number = Some number + 16% of same number



Symbolically, this means that {{{x+0.16x=1.16x}}}. Because we know that the new number is 522, we know that {{{1.16x=522}}}



I'll let you finish.



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