Of the last 500 customers entering a supermarket, 50 have purchased a loaf of bread. If the relative frequency approach for assigning probabilities is used, the probability that the next customer will purchase a loaf of bread is: A. 0.50 B. 0.10 C. 0.90 D. None of the above answers is correct

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.