Monthly precipitation in W, B, and A stations was observed to be 11 .5, 9 .0, and 12 .4 cm, respectively. Precipitation for the same month could not be observed at X station. The normal annual precipitation values for X, W, B, and A are 102 , 114 , 95 , and 122 cm, respectively. Estimate the storm precipitation for X station. All these cities are within a 50 km radius.