5% For every monkey tower? You forgot every specialty building has just one tower which costs increase by 5%?
I think monkey villages should become 5% more expensive, since the farm and the village both are buildings.
I think it should be:
I Reduces the cost of banana farms and their upgrades by 5%
II 10% Extra income for each banana. Banks produce 1000 per round, advisories 2500 per round. They also store 1/4 more money, and give +5% more interest
III Unlimited collecting range, and automatically takes money from banks if maximal money has been reached.
X Increases the cost of monkey villages and their upgrades by 5%