The RC and More Superstore decides to track customer complaints as part of their ongoing customer satisfaction improvement program. After collecting data for two months, their check sheet appears as follows: 
If they construct a Pareto chart, what is the percentage of complaints represented by the problem "Unit not working"?
Definitions:
Federal Income Tax Withholding
The amount of an employee's pay withheld by the employer and sent directly to the government as partial payment of income tax.
FICA Payroll Tax
Federal Insurance Contributions Act tax, a U.S. law requiring a deduction from employees' paychecks and employer contributions to fund Social Security and Medicare.
Social Security
A government program that provides financial assistance to people with inadequate or no income, especially the elderly, disabled, and unemployed.
Medicare
A federal health insurance program in the United States primarily for people who are 65 or older, as well as for some younger people with disabilities.
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