The City Realty Company budgets $190.00 per month for telephone costs, which include the 3% federal excise tax.
City Realty uses 1,500 to 2,000 minutes per month, so it signed
up for the $52.00 plan. In order to stay within budget, what is
the maximum number of lines per month that the City Realty
Company can use?

Her conclusion that 90% of the student body wants the colors changed is an INCORRECT conclusion. The 90% out of 100% is not referring to the total numbers of the student body.For example, 100 people are members of student body if only 50 members responded the survey, then we have:
 90% of 50 members who answered the survey said that they want the changed.