Direction: Select the correct option:
I need a ________ note.

When a number and a noun combine with a hyphen to function as a compound adjective before another noun, the modifying compound block must always be in its singular form.
In the expression "five-hundred rupee note", "five-hundred rupee" acts as a compound adjective modifying the main singular noun "note". Therefore, it is incorrect to pluralize "hundreds" or "rupees" inside the hyphenated modifier block.