
a.
Percentage change in the
Introduction:

Explanation of Solution
Formula to calculate percentage change in price,
Substitute, $114 for price of English textbook in 2016 and $100 for price of English textbook in 2014:
Thus, percentage change in the price of an English textbook from year 2014 to 2016 is 14%.
b.
Percentage change in the price of a Math textbook from year 2014 to 2016.

Explanation of Solution
Formula to calculate percentage change in price,
Substitute, $148 for price of Math textbook in 2016 and $140 for price of Math textbook in 2014:
Thus, percentage change in the price of an Math textbook from year 2014 to 2016 is 5.7%.
c.
Percentage change in the price of Economics textbook from year 2014 to 2016.

Explanation of Solution
Formula to calculate percentage change in price,
Substitute, $200 for price of Economics textbook in 2016 and $160 for price of English textbook in 2014:
Thus, percentage change in the price of Economics textbook from year 2014 to 2016 is 25%.
d.
Price index.

Explanation of Solution
Given,
In the given case the average student purchases three English, two Math and four Economics textbooks.
Formula to calculate price index:
2014:
Given:
2014:
Price of English textbook is $100.
Price of Math textbook is $140.
Price of Economics textbook is $160.
2015:
Price of English textbook is $110.
Price of Math textbook is $144.
Price of Economics textbook is $180.
Calculation of total cost for 2014:
Calculation of total cost for 2015:
Substitute $1220 for total cost of book for current year and $1338 for total cost of book for base year in formula (I):
2015:
Given:
2015:
Price of English textbook is $110.
Price of Math textbook is $144.
Price of Economics textbook is $180.
Calculation of total cost for 2015:
Substitute $1338 for total cost of book for current year and $1338 for total cost of book for base year in formula (I):
2016:
Given:
2015:
Price of English textbook is $110.
Price of Math textbook is $144.
Price of Economics textbook is $180.
2016:
Price of English textbook is $114.
Price of Math textbook is $148.
Price of Economics textbook is $200.
Calculation of total cost for 2014:
Calculation of total cost for 2015:
Substitute $1438 for total cost of book for current year and $1338 for total cost of book for base year in formula (I):
Thus, price index for 2014 is 91.18, for 2015 is 100 and for 2016 is 107.47.
e.
Percentage change in price index from 2014 to 2016.

Explanation of Solution
Formula to calculate percentage change in price index:
Substitute 107.47 for price index in year 2016 and 91.18 for price index in year 2014:
Thus, percentage change in price index from 2014 to 2016 is 17.86%.
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