Griffith & Associates is trying to determine how often it needs to deposit payroll taxes for the calendar year 2015. The company made the following quarterly payroll tax deposits during the last two years: 
a. What is the lookback period and amount?
b. In 2015, how often must Griffith & Associates make payroll deposits?
Definitions:
CPU
Known as the Central Processing Unit, this crucial element of a computer handles the bulk of its computational processes.
eSATA
External Serial Advanced Technology Attachment, an extension of the SATA interface to connect external storage devices with high-speed capabilities.
USB 3.0
A version of Universal Serial Bus (USB) standard that supports higher data transfer rates compared to its predecessors.
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A software tool used to scan wireless networks in the vicinity, analyzing and providing information on their signal strength, security, and channel usage.
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