Trouble using variable in system.tag.read statement

Here is the hard coded statement that works…

LGW = system.tag.read(“QC_Robot_1/Standards/12ozBowl/LSL-GramWeight.Value”)

Here is the script I need to work…

selected = (event.source.parent.getComponent(‘Dropdown’).selectedLabel)
LGW = system.tag.read(“QC_Robot_1/Standards/[color=#FF0040]selected[/color]/LSL-GramWeight.Value”)

My brain is not working this morning, whats the syntax for doing this?

[code]

selected = (event.source.parent.getComponent(‘Dropdown’).selectedLabel)
LGW = system.tag.read(“QC_Robot_1/Standards/%s/LSL-GramWeight.Value” % selected)[/code]