subtracting a percentage from a value in php -

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I is typing something similar to the coupon code function, and the set amount of the amount together with the set amount

My code is as follows; 

  $ amount = "25"; // Discount amount $ percent = "yes"; // Is the coupon (yes) percent, or (any) a flat amount if ($ percent == "yes") {$ newprice = ???????; // Decrease the amount of Dollar value; from $ value; And {$ newprice = $ value - $ amount; // if not a percentage, completely subtract from value}

I'm searching for you to find Google while searching for a solution, but I thought the ID was posted here In addition to helping others, there is also one problem which can be the problem.

How about it? 

  $ newprice = $ value * (($ 100- $) / 100);

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