A leading brokerage firm charges a 6% commission on gold purchases in amounts from` 500 to ` 3000. For purchases exceeding ` 3000, the firm charges 2% of the amount purchased plus ` 120. Let x denote the amount of gold purchased (in rupees) and let f (x) be the commission charges as a function of x .
i) Describe f (x) . What is the domain of f ?
ii) Find f (1000) and f (5000).
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