The percent distribution of a person's accumulating specific amounts of credit card charges over a 12-month period is shown in the pie chart. find each probability. credit card charges under $100 31% $100-$499 17% $500-$999 18% $1000-$1999 12% $2000-$2999 6% $3000-$4999 7% $5000-$9999 8% $10,000 or more 1% a. what is the probability that a person's total charges are $1000 or more? nothing (type an integer or a decimal.) b. what is the probability that a person's total charges are less than $1000? nothing (type an integer or a decimal.) c. what is the probability that a person's total charges are $500 to $9999? nothing (type an integer or a decimal.)