Acording to this information. how old is the Shroud?

Question

In 1389, the Bishop of Troyes wrote a memo to the Pope, accusing a colleague of passing off "a certain cloth, cunningly patterened" asd the burial shroud of Jesus Christ. Despite this early testimony of forgery, this so-called Shroud of Turin has survived as a famous relic. In 1988, a small sample of the Shroud of Turin was taken asd scientists from Oxford University, the University of Arizona, and the Swill Federal Institute of Technology were permitted to test it. Suppose the cloth contained 90.7$ of the original amount carbon. According to the information how old is the shroud?

Answer 1

I believe a carbon 14 test about ten years ago show the clothe is younger than the it was purported to be. National Geographic did an examination on it about 20 years ago. They said the image was almost certainly of a genuinely crucified person. For example, the nail holes are in the correct places, the thumbs exhibited signs of being cramped because of a nerve which gets pinched when the nails are banged in, etc.
Unfortunately there was a period in Church history when fake relics were totted as genuine by the Church, and as my minister once said, "There was enough pieces of the cross to build a house."
As much as I would like to believe the Shroud is genuine, I strongly believe in the facts, which is there is no historical proof it came from off the body of Jesus and the C14 test results don't match with it's age - therefore it is a fake. To tout it as genuine when all the evidence is stacked against that theory destroys crediblity with unbelievers, and suggests believers are gulible.

Answer 2

i'd really hate to do the math, and fortunately, i dont have to...

you could probably figure this out on a calculator easily when you can answer the fundamental question that is the one missing peice to your own question:

what kind of carbon are they looking for and what is it's half-life?