Which sentence is correct and why ?
1) Amazon will sell as many as 7 million kindles by the end of year,adding significantly to its earnings since kindle owners appear to buy more books than other shoppers .
2) Amazon will have sold as many as 7 million kindles by the end of year,adding significantly to its earnings since kindle owners appear to buy more books than other shoppers .
3)Amazon will sell as many as 7 million kindles at the end of year,adding significantly to its earnings since kindle owners appear to buy more books than other shoppers
1) Amazon will sell as many as 7 million kindles by the end of year,adding significantly to its earnings since kindle owners appear to buy more books than other shoppers .
2) Amazon will have sold as many as 7 million kindles by the end of year,adding significantly to its earnings since kindle owners appear to buy more books than other shoppers .
3)Amazon will sell as many as 7 million kindles at the end of year,adding significantly to its earnings since kindle owners appear to buy more books than other shoppers












