On Friday september131992 the lira was worth DM 0.013 over the weekend the lira devalued against the DM to DM 0.012 by how much did the lira devalue against the DM?

On Friday september131992 the lira was worth DM 0.013 over the weekend the lira devalued against the DM to DM 0.012 by how much did the lira devalue against the DM?
This problem may be solved by subtracting the value AFTER devaluation from the value BEFORE devaluation. Lira WAS worth 0.013 and devalued to 0.012.: 0.013 - .0.12 = .001 is how much it devalued.