If there is at least one of every coin, especially 1931-s, then the average value would be approximately $200.
The first wheat pennies were dated 1909 so you must have an Indian Head cent. See the Related Question for more details.
All of them. If you have wheat pennies don't spend them save them.
They did not make 1968 wheat pennies.
yes
Not all that much. Most of them in circulated condition are worth about 3 cents from the 1940s-1958 (last year for wheat pennies was 1958). Though error coins and high grade examples will be worth more.
Average value is 2 cents.
Yes, 1 cent.
20 bucks
No, this will decrease the value.
Priceless. The first wheat pennies were made in 1909.
Wheat pennies were not made for close to 900 years after this.
Around 10 cents.