What impact did the airplane and tank have in world war i?
provided the necessary protection for the convoy system
improved trench warfare tactics
introduced the concept of mechanized warfare

At the start of the First World War, aircraft like the B.E.2 were primarily used for reconnaissance. Due to the static nature of trench warfare, aircraft were the only means of gathering information beyond enemy trenches, so they were essential for discovering where the enemy was based and what they where doing

TANKS

Things like barbed wire and machines guns and trenches had turned warfare (from about the time of the US Civil War through WWI) into a process in which the defense had a huge advantage. Tanks changed that. They were able to drive over all sorts of terrain, including trenches and they were able to smash barbed wire.

step-by-step explanation:

100%     = 120

1%= 120/100=   1.2

9%   = 1.2 x 9=     10.8

10.80 to the 120 to get $130.80