What will be the excess of water at the soil surface (mm), if the total precipitation is 150 mm, infiltration in soil is 5 cm and direct evaporation is 10 mm?

Correct option is B

Total precipitation = 150 mm = 15 cm
Infiltration in soil = 5 cm
Direct evaporation = 10 mm = 1 cm
Rainfall excess = Total precipitation - All losses
Rainfall excess = 15 - 5 - 1 = 9 cm
Rainfall excess = 90 mm