Caravan of 5 land from Gloucester to Midlands to Lincolnshire to East Anglia
5,000 coins
20% tax rate = 1,000 coins
4,000 coins left
20% Roman bonus = 800 coins
4,800 coins profit

Caravan of 4 land from Herefordshire to Midlands to Lincolnshire to East Anglia
4,000 coins
20% tax rate = 800 coins
3,200 coins left
20% Roman bonus = 640 coins
3,840 coins profit

Caravan of 5 land from Shroshire to Upper Midlands to Lincolnshire to East Anglia

5,000 coins
20% tax rate = 1,000 coins
4,000 coins profit