I'm the first to admit I don't have a math-wired brain. Gimme a calculator! 
HOWEVER....
Some things even a twit should be able to figure out...
For example:
Let's say the first of the month is a Sunday, just to make this easy. If your ad starts running on the 1st, and runs for 7 days, it will finish up on Saturday the 8th. With me so far? Then you're ahead of 99% of my customers, who think "Sunday to Sunday" = 7 days. No it doesn't...because you have to count the day your ad hits print. Sunday/day one; Monday/day two; and so on.
These are the same ones who say "Run my ad 14 days. Wait, where do I have to start to get two Sundays in there?" Answer: ANY DAY YOU WANT. There is one Sunday each week, so by definition, your two week ad will hit two Sundays. By the same token, there is NO WAY to hit THREE Sundays in a 14-day period. Amazing how often I have to explain this to people.
And when I say (again, random dates), "your ad will expire on July 14th," why do they ask me, "so what's the last day it runs? The 13th or the 14th?" Look, if it expired on the 13th, it would run UNTIL THAT DAY AND NO LONGER. The 14th would have nothing to do with it if the 13th was the expiration day!
Speaking of numbers: Area codes. The first thing we ask you for is your billing phone number. If your area code is 555, and you're calling me in the SAME 555 area code, why do you need to tell me your area code is 555? I love when they ask "do you need my area code?" and I tell them "only if it's a different one." (pause while they think this over). See, probably close to 100% of our calls are local, but anyway logic should tell you that I don't need your area code unless it's different from mine.
Next, credit card numbers: For Master, Visa and Discover, they appear on the card in four groups of four numerals each. Most people's instinct is to read them off the same way. "1234 (pause) 5678 (pause)..etc.
But NO, some people apparently don't register the little hyphens. "123 (pause) 456 (pause)..."
Etc. Throws my rhythm off, for some reason.

HOWEVER....
Some things even a twit should be able to figure out...
For example:
Let's say the first of the month is a Sunday, just to make this easy. If your ad starts running on the 1st, and runs for 7 days, it will finish up on Saturday the 8th. With me so far? Then you're ahead of 99% of my customers, who think "Sunday to Sunday" = 7 days. No it doesn't...because you have to count the day your ad hits print. Sunday/day one; Monday/day two; and so on.
These are the same ones who say "Run my ad 14 days. Wait, where do I have to start to get two Sundays in there?" Answer: ANY DAY YOU WANT. There is one Sunday each week, so by definition, your two week ad will hit two Sundays. By the same token, there is NO WAY to hit THREE Sundays in a 14-day period. Amazing how often I have to explain this to people.
And when I say (again, random dates), "your ad will expire on July 14th," why do they ask me, "so what's the last day it runs? The 13th or the 14th?" Look, if it expired on the 13th, it would run UNTIL THAT DAY AND NO LONGER. The 14th would have nothing to do with it if the 13th was the expiration day!
Speaking of numbers: Area codes. The first thing we ask you for is your billing phone number. If your area code is 555, and you're calling me in the SAME 555 area code, why do you need to tell me your area code is 555? I love when they ask "do you need my area code?" and I tell them "only if it's a different one." (pause while they think this over). See, probably close to 100% of our calls are local, but anyway logic should tell you that I don't need your area code unless it's different from mine.
Next, credit card numbers: For Master, Visa and Discover, they appear on the card in four groups of four numerals each. Most people's instinct is to read them off the same way. "1234 (pause) 5678 (pause)..etc.
But NO, some people apparently don't register the little hyphens. "123 (pause) 456 (pause)..."
Etc. Throws my rhythm off, for some reason.


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