This calculates the percentage that was lost and then the percentage needed to recoup the loss.

Starting Amount --> [text name="Variable_1" memo="the bigger amount"]
Ending Amount --> [text name="Variable_2" memo="the smaller amount"]

The Loss: Going from [var memo="starting amount" name="Variable_1"] to [var memo="ending amount" name="Variable_2"] is a [calc memo="xxx" value="score1=
(100*((Variable_1)-(Variable_2))/(Variable_1)).toFixed(1)"] percent loss.

Recouping the Loss: Getting back from [var memo="ending amount" name="Variable_2"] to [var memo="starting amount" name="Variable_1"] would require a [calc memo="xxx" value="score2=(-100*((Variable_2)-(Variable_1))/(Variable_2)).toFixed(1)"] percent gain.