A 50-second sound has been recorded at a sample rate of 40 000 Hz. Two bytes have been used to store each sample of the sound. Calculate the file size of the sound file in megabytes. Show your working.

The file size of a digital audio file can be calculated using the following formula: `File Size = Sample Rate × Duration × Sample Resolution` 1. **Identify the given values:** * Sample Rate = 40,000 Hz * Duration = 50 seconds * Sample Resolution = 2 bytes per sample 2. **Calculate the file size in bytes:** File Size (bytes) = 40,000 × 50 × 2 File Size (bytes) = 2,000,000 × 2 File Size (bytes) = 4,000,000 bytes 3. **Convert the file size from bytes to megabytes (MB):** For GCSE, it is standard to use the conversion 1 MB = 1,000 KB = 1,000,000 Bytes. File Size (MB) = 4,000,000 / 1,000,000 File Size (MB) = 4 MB.