What is the cell D15 represent on the sensitivity report?

A B D E F G 1 Microsoft Excel Sensitivity Report 2 4 Adustable Cells 5 Final Reduced Objective Akwable Akwable 6 Cel Name Value Cost Coefficient Increase Decrease 7 $B$11 Variables Variable 1 8.5 0.0 5 7 3.4 8 $C$11 Variables Variable 2 4.6 0.0 4 8.5 2333333333 9 10 Constraints 11 Final Shadow Constraint Alkowable Allorable 12 Cel Name Value Price RH Side Increase Decrease 13 $D$4 Constraint 1 Used 40.0 0.5 40 110 7 14 $D$5 Constraint 2 Used 30.0 1.3 30 30 4.666666667 15 $D$6 Constraint 3 Used 13.1 0.0 12 1.076923077 1E+30