Trent earns scores of 70, 88, and 78 on three chapter tests for a certain class. his homework grade is 61 and his grade for a class project is 68. the overall average for the course is computed as follows: the average of the three chapter tests makes up 40% of the course grade; homework accounts for 20% of the grade; the project accounts for 20%; and the final exam accounts for 20%. what scores can trent earn on the final exam to pass the course if he needs a "c" or better? a "c" or better requires an overall score of 70 or better, and 100 is the highest score that can be earned on the final exam. assume that only whole-number scores are given.