What was the percent increase in the average (arithmetic mean) contribution per member of a certain public radio station from 1985 to 1995 ?
(1)Total contributions by members increased from $505,210 in 1985 to $1,225,890 in 1995.
(2)The number of members exactly doubled from 1985 to 1995.
(1)Total contributions by members increased from $505,210 in 1985 to $1,225,890 in 1995.
(2)The number of members exactly doubled from 1985 to 1995.