Help With Pre Calculus Please!!!?

Someone claims to have a painting of the Vermeer for sale. You want to determine if this is a forgery, so you must know when it was painted so you subject it to radioactive carbon dating and find it contains 99.5% of its original Carbon-14 content. For Carbon-14, k= 1.2 x 10^-4/year.
a) What is the age of the painting offered for sale?
b) What percentage of its original Carbon-14 content would an authentic Vermeer contain today?
I would really appreciate the help Thanks

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