Set up a ratio for each of the following and reduce to lowest terms.
(a) 12 dimes to 5 quarters
(b) 15 hours to 3 days
(c) 6 seconds for 50 meters
(d) $72 per dozen
(e) $40 per day for 12 employees for 14 days
(f) 2% per month for 24 months for $5000