Only 6 of the 75 trees in the park are at least 30 ft tall what percent of the trees are under 30 feet tall

subract 6 from 75. then divide that number by 75. 69/75=.92, so 92% of your trees are under 30ft

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads