Click here Two cents' worth
165 "put in one's two cents' worth" (Phrase origins - alt.usage.english)
Origin of Phrases - Have Origins
Note the apostrophe here, two cents' worth.
Certain expressions relating to time, distance, and value also are written with an apostrophe.
• a moment’s reflection
• four months’ wages
• one kilometer’s length
• seven miles’ jog
• a dollar’s cost
• two cents’ worth