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Deben Rate - 72 carob beans copper at 500/2640 grams per carob bean

72/2640*500 = 13.64 grams copper = 0.0300630358 pounds

Now, say this deben is tarriffed as a dupondius, meaning 2 asses.

this makes an as 36 carob beans.  semis as 18 carob, and quadrans as 9 carob, in bronze that is. 

If, now, we divide by 0.6, this makes a quadrans as 15 carob of copper, which is 2.84 grams copper.

I am confusing myself here.  back to the 72 carob beans deben.

0.0300630358 * 3.73900 = 0.112405691$ usd

1/0.112405691 = 8.89634672 deben per us dollar