gmatfighter12 wrote:
At a certain factory, 10 percent of the staplers produced on Monday were defective and 2 percent of the nondefective staplers were rejected by mistake. If 90 of the nondefective staplers were rejected, what was the number of staplers produced that day
A. 4,000
B. 4,200
C. 4,500
D. 4,800
E. 5,000
Given that:
2 percent of the nondefective staplers were rejected.
90 of the nondefective staplers were rejected.
Thus 0.02*{nondefective} = 90 --> {nondefective} = 4,500.
We also know that nondefective staplers were 90% of all staplers, thus 0.9*{total} = 4,500 --> {total} = 5,000.
Answer: E.
Hope it's clear.
This was pretty simple. But I Kind of thought that the 10% includes the erroneously detected 2% and went into an inception spiral