A gas company charges its industrial users according to their gas usage. Their tariff is as follows:

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A gas company charges its industrial users according to their gas usage. Their tariff is as follows:

Quarterly usage/10 units 0-19.999 20-49.999 50-99.999 >100 Standing charge/ 200 400 600 800 Charge per 10

What is the quarterly charge paid by a user?

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