A student s course grade is based on one midterm that counts as 10 of his final grade one class project that counts as 15 of his final grade a set of homework assignments that counts as 35 of his final grade and a final exam that counts as 40 of his final grade His midterm score is 69 his project score is 97 his homework score is 83 and his final exam score is 61 What is his overall final score What letter grade did he earn A B C D or F Assume that a mean of 90 or above is an A a mean of at least 80 but less than 90 is a B and so on His overall final score is Type an integer or a decimal Do not round Xxx