A store received an order of 50 shirts. 20 of the shirts are blue. If one shirt is chosen out of the 50 at random, what is the probability the shirt will not be blue? Give answer as a percent.

Can someone tell me how to solve this?

30 out of 50 are not blue

30/50 = 60/100 = 0.60
0.60 * 100 = 60%