The following table represents the category wise count of books in your local libraries. | Category | ABL | GHL | MNL | PQL | | Self-Help | 150 | 170 | 200 | 200 | | Non-Fiction | 500 | 600 | 550 | 600 | | Fiction | 750 | 610 | 700 | 600 | | Management | 100 | 130 | 100 | 110 | | Comics | 175 | 100 | 100 | 75 | | Technical | 115 | 100 | 150 | 200 | The difference between the total number of Non-Fiction and Management books of all four libraries is:

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