'Rate' in the Bible

Abraham agreed with Ephron, and Abraham weighed out to Ephron the silver that he had agreed to in the presence of the Hittites: 400 shekels of silver at the current commercial rate.

“If a man consecrates to the Lord any part of a field that he possesses, your assessment of value will be proportional to the seed needed to sow it, at the rate of 50 silver shekels for every five bushels of barley seed.