How much is a1776-1976 coin set worth minted in 1976?

Unfortunately 5 different U.S. Mint issued sets have the bicentennial dual date 1776-1976. They were struck as Proof & Uncirculated in copper-nickel and 40% silver.

A 3-piece set is 40% silver with a value of about $25.00. The rest are $6.00.