Each week, Giuseppe Pizzeria purchases a mixture of 30 pounds of cheese and 20 pounds of flour. This week, the restaurant purchased 20% less cheese and 40% less flour. By what percentage did the total weight of the purchase decrease?

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Each week, Giuseppe Pizzeria purchases a mixture of 30 pounds of cheese and 20 pounds of flour. This week, the restaurant purchased 20% less cheese and 40% less flour. By what percentage did the total weight of the purchase decrease?