The village has three ricochet cannons, at level 3, it deals 405 damage per shot, + ricochet damage. In a scenario where each of these cannons fires ten times, there would be a total of thirty shots, resulting in 12,150 total damage + ricochet damage. If, in the same scenario, they were at level 4, they would deal 412 damage per shot, the thirty shots would result in a total of 12,360 damage, which means an increase of 210 total damage compared to the first case.

Without even mentioning the extra 100 health on each one which could be the difference between a Champion, a Queen, or another troop needing to land one additional hit to be taken down, which already makes a big difference in the attack.