To multiply a decimal number by 100,

move the decimal point two places to the right.

o move the decimal point two places to the left.

move the decimal point one place to the right.

move the decimal point one place to the left.

move the decimal point two points to the right

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