A friend has a \( 82 \% \) average before the final exam for a course. That score includes everything but the final, which counts for \( 30 \% \) of the course grade. What is the best course grade your friend can earn? What is the minimum score would your friend would need on the final to earn a \( 75 \% \) for the course? Give answers accurate to at least one decimal place.
best grade = 87.4%
minimum score is 58.7%