Answer: $90
Step-by-step explanation:
Let x = Total advertising cost (in billions).
Given: U.S. advertisers spent on television advertising = $60 billion = 40 percent of total advertising.
i.e. 0.40x= 60

i.e. Total advertising cost = $150 billions
The amount spent by U.S. advertisers on all other forms of advertising = (Total advertising cost) - (Amount spent on spent on television advertising)
= $(150-60)
= $90
Hence, the amount spent by U.S. advertisers on all other forms of advertising = $90