A cost for shipping by the Boston Mailing Company is based on the amount that a customer spends. For customers spending under $50, the shipping rate is $10; for $50 to under $100, the shipping rate is $7; for $100 to under $140, the shipping rate is $4; for $140 and over the shipping rate is $2. What domain interval will have a shipping rate of $4?
A. 100 _< s < 140
B. 100 < s < 140
C. 50 _< s < 100
D. 100 < s _< 140
The domain interval that will have a shipping rate of $4 is 100 ≤ s < 140.
Thus, the correct answer is:
A. 100 ≤ s < 140