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Calculations In PHP

I am needing to perform a calculation and round the results all in my php. I have tried the below but I always end up with a 0. Which if I manually perform the calculation should not be the case. Below is my syntax and what I am after is

val1-val2
answer from above / val1
answer from above * 100 (to get percent)

Here is the syntax I use

print "<td>" . number_format(round($res->val1-$res->val2/$res->val1)*100) . "%" . "</td>";

edit
Let's use real life example $val1 = 1122 $val2 = 280

I want the calculation steps to be $val1-$val2 = 842
Then 842/$val1 or 842/1122 = .75

If I use ($val1-$val2)/$val1 = 1 which is incorrect.

Solution 
  • echo round((($val1 - $val2) / $val1) * 100).'%';

    Works fine? See here https://3v4l.org/d4bpe