According to a survey conducted by Independent Sector, the percent of
their income that Americans give to charities is related to their
household income. For families with an annual income of $100000 or
less, the percent approximately given by
P(x) = 0.0014x² – 0.1529x + 5.855, 5 ≤ x ≤ 100 where P is
the percent of annual income given and x is the annual income in
thousands of dollars. According to this model, what income level
corresponds to the minimum percent of charity contributions, to the
nearest whole number?