How much is a 1978 silver dollar with a d above the date worth?

A 1978 silver dollar with a "D" mint mark indicates it was minted in Denver. However, it's important to note that the 1978 Eisenhower dollar is not made of silver; it is composed of a copper-nickel blend. If you have a 1978 Eisenhower dollar, it typically has a value of about $1 to $2, depending on its condition. If you are referring to a different silver dollar, please clarify the specific coin.