Express each of the following as a ratio of the first quantity to the second, in its lowest term, (i) in the form a : b, (ii) as a fraction: (a) 25 cents, 80 cents (b) 210°, 360° (c) 250 cm, 1 m (d) 80 cents, $1.20 (e) 1 kg 250 g, 3 kg (f) 3 min 30 s, 1 h
