Monthly expenditure on fruit and vegetables in families living in Warsaw was examined. It is
known that 10 families spend not more than PLN 200, 58 families not more than PLN 400, 78
families not more than PLN 600, 95 families not more than PLN 800 and 100 families not more
than PLN 1000. What are the minimum expenses of 75% of the families spending the most?