QUESTION $2$

An experimental rectangular plot of $12$ km $\backslash$times $12$ km has five rain gauge stations as shown in the figure. The storm rainfall and coordinates of the stations are given in the table.

Station X $($km$)$ Y $($km$)$ Annual Rainfall $($cm$)$

A $1380$

B $811119$

C $310133$

D $58163$

E $75155$

Use the inverse distance method to compute the areal average of annual rainfall $($cm$)$ at the center of the watershed. Enter the asnwer as an integer $($like $987)$ without unit.