Convert the following grade letter to the corresponding grade percentage.
Grade letter: B
The grade percentage for letter grade B typically corresponds to a range between 80% to 89%. However, the exact percentage equivalent may vary depending on the specific grading scale being used.
Complete the following task based on the instruction and optional input provided.### Instruction:
Convert the following grade letter to the corresponding grade percentage.

### Input:
Grade letter: B

### Output:
The grade percentage for letter grade B typically corresponds to a range between 80% to 89%. However, the exact percentage equivalent may vary depending on the specific grading scale being used.