Question: A large drainage basin can be divided into four sub-basins. The areas of the sub-basins are 52 km2, 77 km2, 35 km2, and 68 km2.

A large drainage basin can be divided into four sub-basins. The areas of the sub-basins are 52 km2, 77 km2, 35 km2, and 68 km2. The average annual precipitation in each is 124 mm, 114 mm, 126 mm, and 99 mm, respectively. Determine the average annual precipitation (in cm) for the whole drainage area.

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