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It costs Rs x each to make the fir...

It costs Rs `x` each to make the first thousand copies of a compact disc and Rs `y` to make each subsequent copy. If `z` is greater than 1000, how much will it cost to make `z` copies of the compact disc? `z x-z y` (b) `1000 x+y z` (c) `1000(x-y)+y z` (d) `1000(z-y)+x z`

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