After applying a 60% reduction, what is the spindle speed?

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Multiple Choice

After applying a 60% reduction, what is the spindle speed?

Explanation:
A 60% reduction leaves 40% of the original speed. So the final spindle speed is original speed times 0.40. If the starting speed is 1150 rpm, then 1150 × 0.40 = 460 rpm. A quick check: 60% of 1150 is 690, and 1150 − 690 = 460. So the resulting speed is 460 rpm.

A 60% reduction leaves 40% of the original speed. So the final spindle speed is original speed times 0.40. If the starting speed is 1150 rpm, then 1150 × 0.40 = 460 rpm. A quick check: 60% of 1150 is 690, and 1150 − 690 = 460. So the resulting speed is 460 rpm.

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