Examples of prices charged by Phones-R-Us for long-distance telephone calls within Canada at different times of the

Question:

Examples of prices charged by Phones-R-Us for long-distance telephone calls within Canada at different times of the day and week are as follows:
Peak period (8 a.m. to 6 p.m., Monday through Friday) ...................Basic rate
Evenings (6 p.m. to 11 p.m., Monday through Friday) .....................35% savings
Nights and weekends ............................................................60% savings
Required
Are there differences in incremental or outlay costs per minute for Phones-R-Us for telephone calls made during peak hours compared with telephone calls made at other times of the day?