1. Write a program that should ask user to enter three test scores (in the range...

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1. Write a program that should ask user to enter three test scores (in the range of 0 to 100), compute the average of the three scores, and display the average and a letter grade for this average based on the following policy: Score 90-100 Letter grade A 86-89 AB 80-85 B 76-79 BC 70-75 C 60-69 D <60 F 1. Write a program that should ask user to enter three test scores (in the range of 0 to 100), compute the average of the three scores, and display the average and a letter grade for this average based on the following policy: Score 90-100 Letter grade A 86-89 AB 80-85 B 76-79 BC 70-75 C 60-69 D <60 F