A degenerate North-West corner allocation, verified by direct cost computation

A dairy firm has three plants $P_1,P_2,P_3$ located in a state. They daily milk production at each plant (in thousand litres) is $P_1\to6, P_2\to1, P_3\to10$. Each day, the firm must fulfil the needs of its four distribution centers $D_1,D_2,D_3,D_4$. The minimum requirement at each center (in thousand litres) is $D_1\to7,\ D_2\to5, D_3\to3, D_4\to2$. Cost in hundred of rupees of shipping one thousand litres from each plant to each distribution center is given by the table with rows $P_1=(2,3,11,7)$, $P_2=(1,0,6,1)$, $P_3=(5,8,15,9)$. Then the initial basic feasible solution by North-West Corner method is: