John cleaned the windows in his house. After breakfast John cleaned $20\%$ of the windows. After lunch he cleaned

John cleaned the windows in his house. After breakfast John cleaned $20\%$ of the windows. After lunch he cleaned $30\%$ of the remaining windows. Afterward, John cleaned $50\%$ of the final remaining windows. What percent of the total number of windows were not cleaned?

A. $25\%$
B. $28\%$
C. $30%$
D. $32\%$
E. $35\%$

OA B

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