Round off the two decimals places
(a) 42.535
(b) 54.2245
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if this is really you s much. i only have 3 points left and i have 2 questions to ask

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