The rainfall for the month of July was above average. The water level in a small lake measured 8 feet at the beginning of the month. Due to all the rainfall, the water level rose of a foot per week for the first three weeks, then the lake dropped - foot in the last week of the month. What was the water level of the lake at the end of July? A ft. 20 OB 10 t. 10 20t

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