1 - 10 units: S$3211 - 50 units: S$30 More than 51 units: S$26
1 - 10 units: S$2111 - 50 units: S$16.5 More than 51 units: S$15
1 - 10 units: S$1811 - 50 units: S$13 More than 51 units: S$12
1 - 10 units: S$66 More than 11 units: S$57
1 - 10 units: S$7.1311 - 20 units: S$6.53 More than 21 units: S$5.94
