The price will depend on the edition of the stamps and the condition of the cover.
Scott's Specialized US Catalog lists prices for First Day Covers (FDCs) as well as plate blocks.
Yes
Yes
First Day Covers are worth more than ordinary covers. Stamps bought on the first day themselves, without cancellations, cannot be identified as being issued on the first day. Leave them on the cover if you have them!
Sub of the day as low as RM7.50
A day's range refers to the difference between the highest and lowest prices at which a stock or security trades in a single day. It provides an indication of the price volatility or fluctuation within that trading day.
The first price in 1999 (close) was $33.53, the closing price of the last trading day in 1999 was $51.58. The price range was appox. $53-32. One stock split (3:1) was performed in May 2000. These are adjusted prices.
The price of it varies every day. I have seen many different prices so try to find a price range that it falls in.
N. C. Porter has written: 'Collecting modern first day covers of Great Britain 1971-81' -- subject(s): First-day covers (Philately), Catalogs
The price range for Avon Anew Platinum Day Cream SPF 25 starts at about $15.75 up to $19.95 on Amazon. Avon offers this product for $12.00 up to $38.00.
A lot of money.
First Day Covers without any address are preferred by many collectors. As long as the handwriting is relatively neat, how the address is affixed has little affect on value.