Macroeconomic

1) The price of cranberryjuice a year ago was $4.00 per gallon.The price today is $4.20.What is the percent change in the price of cranberryjuice?(Type the answer using decimal notation, not in percentage units. If the percent change is negative, i.e. negativerather than positive growth, then type in the minus sign.)

2) The price of cranberryjuice a year ago was $4.00 per gallon.The price today is $4.20.What is the averageprice of cranberryjuice between the two points in time?

3) In group A, the number of laptop factoriesis 15, and the cost per laptop is $100 on average.In group B, there are 5 factories that makethis same laptop, and the cost is $150 per laptop on average.Determine the weighted average of the laptop in the two groups.(The answer will be in dollars per laptop