Figuring out probability of two random events both happening

So here's the problem:

The table below shows the distribution of education level attained by US residents based on data collected during the 2010 American Community Survey:

Highest level of education %

Less than 9th Grade 0.10

9th to 12th no diploma 0.09

High school grad - GED 0.25

Some college No degree 0.23

Associate's degree 0.08

Bachelor's degree --

Graduate or professional degree 0.09

Answer the following questions (give all answers to 2 decimal places):

a) Fill in the empty box for the proportion of US residents whose highest education level attained was a bachelors degree.

b) If two individuals are chosen at random from the population, what is the probability that both will have at least a bachelors degree?

c) If two individuals are chosen at random from the population, what is the probability that at least one will have some college or a college degree of some sort?

d) If two individuals are chosen at random from the population, what is the probability that exactly one will have some college or a college degree of some sort?

I managed to figure out a) which was 0.16. However, I tried a different methods to get b) but none of them worked. I answered .24, .25, and .01 but none of them were correct.

To answer b) I used the following formula:

P(A or B) = P(A) + P(B) - P(A & B) = (.16) + (.09) - (.16)(.09)

which gave me .24 but that was incorrect. What am I doing wrong?

So here's the problem:

The table below shows the distribution of education level attained by US residents based on data collected during the 2010 American Community Survey:

Highest level of education %

Less than 9th Grade 0.10

9th to 12th no diploma 0.09

High school grad - GED 0.25

Some college No degree 0.23

Associate's degree 0.08

Bachelor's degree --

Graduate or professional degree 0.09

Answer the following questions (give all answers to 2 decimal places):

a) Fill in the empty box for the proportion of US residents whose highest education level attained was a bachelors degree.

b) If two individuals are chosen at random from the population, what is the probability that both will have at least a bachelors degree?

c) If two individuals are chosen at random from the population, what is the probability that at least one will have some college or a college degree of some sort?

d) If two individuals are chosen at random from the population, what is the probability that exactly one will have some college or a college degree of some sort?

I managed to figure out a) which was 0.16. However, I tried a different methods to get b) but none of them worked. I answered .24, .25, and .01 but none of them were correct.

To answer b) I used the following formula:

P(A or B) = P(A) + P(B) - P(A & B) = (.16) + (.09) - (.16)(.09)

which gave me .24 but that was incorrect. What am I doing wrong?