Based on the cost of the quarter-page ad per page, the cost per thousand charged by the Chronicle is $10 per page.
This can be found by the formula:
= 1,000 x Cost of ad / Thousands of subscribers
Solving gives:
= 1,000 x 180/ 18,000
= 1,000 x 0.01
= $10
In conclusion, the CPM is $10.
Find out more on cost per thousand at https://brainly.com/question/13498104.