Input (grade 8): Megabyte is sometimes used in place of mebibyte, or to refer to 106 bytes = 1,000,000 bytes, or even 1,000 times 1,024 bytes, depending on context.
Output (grade 10): This can either be a synonym for mebibyte, or refer to 106 bytes = 1,000,000 bytes, depending on context (see binary prefix for background).