Please help me understand this.

Create a new variable called Index such that Index $=$ Rating$1+$ Rating $2+$ Weight $1+$ Weight $2.$ The

median value of Index for Employees is:

A$)305\mathrm{.}100$

B$)305\mathrm{.}690$

C$)302\mathrm{.}113$

D$)295\mathrm{.}200$