In capacity planning, what does a steady increase in the ratio of peak-to-average demand over historical periods typically indicate? (difficulty: hard)

In analyzing profit margins for a GMAT Data Insights question, if a company's net profit margin decreases from 12% to 9% while revenue increases from $10M to $13M, what percentage change occurred in the absolute profit amount? (difficulty: hard)

In psychographic segmentation, which combination of characteristics would most likely indicate an 'early adopter' consumer segment? (difficulty: hard)

In analyzing stock market returns, if a portfolio's daily returns have a standard deviation of 2% and assuming a normal distribution, approximately what percentage of returns fall within two standard deviations of the mean? (difficulty: medium)

In inventory analysis, if a company's DSI decreased from 73 to 52 days while sales remained constant, what is the percentage increase in inventory turnover ratio? (difficulty: hard)