Andrew R. answered 05/12/17
Tutor
5.0
(269)
High School Science Educator with Masters Degree from Univ of Illinois
You would set this question up as proportion.
$20/30min = x/1min
You would then cross multiply to get...
30x=20
Divide by 30 on both sides...
x=.6666 repeating
Round to the nearest cent...
x=67 cents