Answer:
$0.30
Step-by-step explanation:
We have been given that an advertiser who uses ad scheduling has a custom bid adjustment for 9 p.m. to 12 a.m. on weeknights. The normal bid is US$0.40 and the bid multiplier is -25%.
The advertiser bidding for the given time period would be $0.40 minus 25% of $0.40.
[tex]\text{Advertiser bidding}=\$0.40-(\frac{25}{100}\cdot \$0.40)[/tex]
[tex]\text{Advertiser bidding}=\$0.40-(\frac{1}{4}\cdot \$0.40)[/tex]
[tex]\text{Advertiser bidding}=\$0.40-(\frac{1}{1}\cdot \$0.10)[/tex]
[tex]\text{Advertiser bidding}=\$0.40-\$0.10[/tex]
[tex]\text{Advertiser bidding}=\$0.30[/tex]
Therefore, the advertiser bidding for 9 pm to 12 am would be $0.30.