It'll help even more if you can select the level troops along with the unit type. For example:
20% Level 7 Infantry
10% Level 8 Infantry
15% Level 7 Cavalry
15% Level 8 Cavalry
10% Level 8 Archers
5% Level 7 Archers
15% Level 6 Archers
5% Level 8 Chariot
5% Level 7 Chariot