Answer:
40% of the price of ads during the week or 60% less by advertising on Saturdays
Explanation:
The department store pays on a normal week day for two days a week will be
1/4 * (2 days) * (16 weeks )* x= 8 x
However on Saturdays ads the department store pays
1/4 * (1 days) * (16 weeks ) * 0.8 * x = 3.2 * x to the Country Times on Saturdays
Which is 40% of the price of ads during the week or 60% less by advertising on Saturdays