\begin{questions}

    \question Lucy records using her camera. The camera saves the
    audio and video parts of the recording seperately. Lucy transfers
    recording to her computer. The audio file has a size of 12.8 kB.
    Audio is recorded at a sample rate of 320 kB per second. The audio
    resolution is 32 bits.

    \begin{parts}

        \part[5] In minutes, how many seconds was the recording.
        \vspace{\stretch{1}}

        \part[5] A video file consists of many still frames. Each
        frame is a normal image. The size of a video file can
        therefore be expressed as:

        \begin{align*}
            \mbox{Video file size} = \mbox{Number of frames} \times
            \mbox{Size of each frame}
        \end{align*}

        If each frame is 1920 pixels wide and 1080 pixels high in
        resolution, and the bit depth of 24 bits, what is the file
        size of the video file. 
        \vspace{\stretch{1}}
        
        \pagebreak

        \part[1] Lucy combines the audio and video to form a file. She
        then runs a lossy compression algorithm on the resulting file.
        What is lossy compression?
        \vspace{\stretch{1}}

        \part[3] The file size after compression is reduced by 20\%.
        What is the final file size?
        \vspace{\stretch{1}}

        \part[1] State an assumption made for part (d).
        \vspace{\stretch{1}}

    \end{parts}
    \droptotalpoints

\end{questions}