'Pence' in the Bible

But the same servant went out, and found one of his fellowservants, which owed him an hundred pence: and he laid hands on him, and took him by the throat, saying, Pay me that thou owest.

For it might have been sold for more than three hundred pence, and have been given to the poor. And they murmured against her.

There was a certain creditor which had two debtors: the one owed five hundred pence, and the other fifty.

And on the morrow when he departed, he took out two pence, and gave them to the host, and said unto him, Take care of him; and whatsoever thou spendest more, when I come again, I will repay thee.

Why was not this ointment sold for three hundred pence, and given to the poor?