Math not working correctly in PHP? -

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I am trying to complete the percentage of sales according to the amount originally purchased, here is the code that I I am doing it out with: 

  $ sold = 212; Bought $ 213; Echo round ($ $ sold $ sold) * 100). "%";   
 Why is it happening  100%  when it is not clearly? It should not be  99.5%    
 
 
 OK, you're rounding Here are the results ...  
 Try this with:  
  resonance round (($ $ / $ sold $ $ 100,1). "%";

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