Q&A. While we often think of expenses as salaries, advertising, rent, interest, and so on, the cost of goods sold is also an expense. The cost of goods that were sold needs to be matched with the pertinent sales on the income statement, just as commission expense must be matched with sales or other revenues.
In music, an octave (Latin: octavus : eighth) or perfect octave is the interval between one musical pitch and another with half or double its frequency. It is defined by ANSI as the unit of frequency level when the base of the logarithm is two.or example, if one note has a frequency of 440 Hz, the note an octave above it is at 880 Hz, and the note an octave below is at 220 Hz.
An octave, as the name suggest has the number 8 related with it. There are 7 major notes in music viz. C D E F G A B || C D E F G A || C D... As you further move ahead the pitch increases. The lower C has a lower pitch than the higher C, but the sound that the note creates is the same. The number of notes between the higher and lower C (Including the higher C), are 8. Thus an octave is difference between a particular note, and its higher or lower counterpart in terms of pitch.