In June, Becky opened a $20,000 bank CD paying 1% interest, but she had to withdraw the money in a few days to cover one child's college tuition.

In June, Becky opened a $20,000 bank CD paying 1% interest, but she had to withdraw the money in a few days to cover one child's college tuition. The bank charged her $1,000 in penalties for the withdrawal. What percent of the $20,000 was she charged