Resize Groupitems using Javascript

below is the code iam using to resize the width to 100px, but it resized to 101px/99px. (due to Percentage value)

Please suggest to resize appropriately 100px width

var objectBounds = docRef.visibleBounds;

var W = objectBounds[2] - objectBounds[0];    // figures the width

var H = objectBounds[1] - objectBounds[3];     // figures the height

var ReziseWidth=100;

var percentageX = Math.round((ReziseWidth / W) * 100);

var percentageY = percentageX;

app.executeMenuCommand ("selectall")

app.executeMenuCommand ("group")

docRef.groupItems[0].resize(percentageX, percentageY);