In the figure given below, the source is balanced with the following line voltages $($rms$)$:

$V_{ab}=\frac{400}{{?}_0}V$

$V_{bc}=\frac{400}{{?}_{-}}120V$

$V_{ca}=\frac{400}{{?}_{120}}V$

The load is unbalanced with the following impedances in each phase:

$Z_{AB}=34\mathrm{.}9+j76\mathrm{.}2$

$Z_{BC}=50+j60$

$Z_{CA}=40-j60$

What will be reading of the wattmeter $W_1$ in $W?$