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$3.$ CALCULATE A SUITABLE RANGE OF $6$ ROTATIONAL SPEEDS $($RPM$)$ OF A DRILLING MACHINE'S MAIN SPINDLE, if the drill size range is between $2\mathrm{.}5$ mm and $10$ mm $.$ The cutting speed for this lot $($tool $-$ work $-$ cutting fluid combination$)$ is constant at $22\frac{m}{m}i$

$ute.(10$ pts$)$