'Shekels of Silver' in the Bible

There was a great famine in Samaria, and behold, a siege [was] against it, until the head of a donkey [went] for eighty shekels of silver, and one fourth of the measure of the dung of doves [went] for five shekels of silver.

Menahem exacted the money from Israel, from all {the very rich}, to give to the king of Assyria fifty shekels of silver for each one. Then the king of Assyria returned and did not stay there in the land.