GRE Sample Test 1 Quantitative Reasoning 2

Identify the markers for September 1989 and October 1989 on the chart. The question is asking about the least percent increase between these two data points. So, begin by evaluating the data points. All of the differences between the data points for these two months are very similar; they all seem to have a difference of approximately 0.5.
Because 0.5 is a lesser percent of a greater number the least percent increase corresponds to the data point with the greatest numbers. Therefore, the correct answer is (E), child safety. Alternatively, find the percent increase for each of the answer choices by dividing the difference between the two points by the original, which in this case is the number for September 1989. The least percent increase is still (E), child safety, which is the correct answer.