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5-104.

The average annual rainfall in Tucson, Arizona is 12 inches. Between January and April, 2.4 inches of rain fell. What percentage of the annual rainfall fell after April (May through December)? You may want to draw a diagram to organize information. Homework Help ✎

If 2.4 inches of rain fell between January and April and the annual rainfall is about 12 inches,
the remainder must have fallen from May through December.

Since 12 − 2.4 = 9.6, the rainfall from May through December must be 9.6 inches.
If 9.6 inches is taken as a fraction of the total average annual rainfall of 12 inches,
what percentage of the annual rainfall after April does this fraction represent?

$\frac{9.6}{12} \rightarrow \frac{96}{120} \rightarrow \frac{4}{5}$