Thirty years ago, Mr. and Mrs. Lopez purchased a house. On average, the value of the house has doubled every 6 years. If the house is worth $320,000 today, what did they pay for it 30 years ago?
(A)$5,000
(B)$10,000
(C)$64,000
(D)$160,000
(E)$320,000*2^5
(A)$5,000
(B)$10,000
(C)$64,000
(D)$160,000
(E)$320,000*2^5
