Kathy is measuring the rainfall in a rain gauge for her science project.The first week, she measured 2 1/4 inches of rain.

Kathy is measuring the rainfall in a rain gauge for her science project.The first week, she measured 2 1/4 inches of rain. The second week, she measured twice as much rain, and the third week she measured half as much rain as the first week. It did not rain at all in the 4th week. AHow much rainfall did Kathy measure for the entire month?