Subject: mathqa
Question: the price of a certain product increased by the same percent from 1960 to 1970 as from 1970 to 1980 . if its price of $ 1.20 in 1970 was 150 percent of its price in 1960 , what was its price in 1980 ?
Option: 
A: $ 2.40
B: $ 2.00
C: $ 1.80
D: $ 3.00
Answer: C