The average cost of a long-distance call in the USA in 1985 was 44 cents per minute, and the average cost of a long-distance call in the USA in 2005 was 11 cents per minute. Find the approximate percent decrease in the cost per minute of a long- distance call. (adapted from 2007 AMC 8, Question \#6) 
选项为:A:$$25$$  B:$$50$$  C:$$75$$  D:$$100$$  E:$$125$$  请回答其中一个选项.