In a factory, workers work in three shifts, say shift $1,$ shit $2$ and shift $3$ and they get wages in the ratio $3:4:8$ depending on the shift $1, 2$ and $3$ respectively. Number of workers in the shifts are in the ratio $3:2:5.$ If the total number of workers working is $1500$ and wages per worker in  shift $1$ is $\mathrm{Rs}.\mathrm{ }300,$ then the mean wage of a worker is