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Uniform Circular Motion Problem

Here is(are) the __question(s)__:

"Find the centripetal acceleration for each of the following:

(a) a point on the earth's equator (ignore its orbital motion);

(b) the earth in its orbit around the sun;

(c) the sun's orbit around the center of the Milky Way (period = 2 x 10^8 y; radius = 3 x 10^20 m"

__(Correct) Answers:__

(a) 3.37 x 10^(-2) m/s

(b) 5.9 x 10^(-3) m/s^

(c) 3 x 10^(-10) m/s

I get (a) ac = 2.97 x 10^(-10) m/s^2 which is wrong. What am I doing wrong?

(My work is attached)

Any help would be greatly appreciated!

Thanks in advance!