You are developing a performance progress report for a project you are managing. The following timephased budget was developed earlier in the planning stage and is being used as the standard against which the project performance is measured.

$\backslash$table$[[$Work Packages,W$1,$W$2,$W$3,$W$4,$W$5,$W$6],[$A$,4,8,6,,,],[$B$,,,,6,,],[$C$,,,,,7,8],[$Total$,4,8,6,6,7,8]]$

You are analyzing the project performance at the end of Week $5.$ Activity $"C"$ is $80\%$ complete and its actual cost is $15.$ What is the schedule variance of this activity?

Use two decimal places in your calculations.