The following table provides the prices of the tickets for three types of water rides at an amusement park. 
a.Compute the unweighted aggregate price index for 2010,using 2009 as the base year.
b.Compute the unweighted aggregate price index for 2011,using 2010 as the base year.
Definitions:
Clarify
To make a statement or situation less confused and more comprehensible.
Criterion
A standard or rule by which something can be judged or decided.
Timely Information
Information received or provided at an appropriate time to influence decision-making.
Decision Making
A process of selecting the best option from among various alternatives based on criteria and information.
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