In a multiple-step calculation, is it better to round off the numbers to the correct number of significant figures in each step of the calculation or to round off only the final answer? Why?

A new IPhone is estimated to lose 25% of its value every semi-anually after its purchase. How much is the value of an IPhone that costs $799 after someone has owned it for 2 years? Please round your answer to the nearest cents ( or hundredths, or 2 decimal places), for example: $12.15

Suppose that an actuary for an insurance company found that the life expectancy of people (living in Country A) is 78 (SD = 5). What percent of people living in this country will die before the age of 85? Enter a two-digit number ONLY without the percent sign ("%"). Round to the closest whole number.

The average annual cost of living in Illinois, California, and Oregon are displayed in the table below:   State Average Annual Cost of Living Illinois $58,000 California $70,000 Oregon $64,000 Suppose you are earning a salary of $65,000 per year in Illinois. Your employer asks you to transfer to the California office. Based on the average annual cost of living, what is the lowest possible salary you will accept? Round your answer to the nearest whole dollar. Explain your reasons.

When the ballots in box 1 were counted, there were 5,180. In box 2 there were 4,848, and in box 3 there were 2,784. Jessica received 2/5 of the votes. How many votes did she receive?