What is the main difference between a conceptual model and a physical model?

The u.s. stock market has returned an average of about 9% per year since 1900. this return works out to a real return (i.e., adjusted for inflation) of approximately 6% per year. if you invest $100,000 and you earn 6% a year on it, how much real purchasing power will you have in 30 years?

Garrett is an executive vice president at samm hardware. he researches a proposal by a larger company, maximum hardware, to combine the two companies. by analyzing past performance, conducting focus groups, and interviewing maximum employees, garrett concludes that maximum has poor profit margins, sells shoddy merchandise, and treats customers poorly. what actions should garrett and samm hardware take? a. turn down the acquisition offer and prepare to resist a hostile takeover. b. attempt a friendly merger and use managerial hubris to improve results at maximum. c. welcome the acquisition and use knowledge transfer to impart sam hardware's management practices. d. do nothing; the two companies cannot combine without samm hardware's explicit consent.

From 1960 to 1970, the consumer price index (cpi) increased from 29.6 to 48.2. if a dozen donuts cost $0.89 in 1960 and the price of donuts increased at the same rate as the cpi from 1960 to 1970, approximately how much did a dozen donuts cost in 1970?