Solve the problem.Softee Blankets charges $6 for shipping orders of $20 or less, $10 for orders from $20.01 to $70, and $15 for orders over $70. One week shipping charges for 510 orders totaled $5100. There were 30 more orders for $20 or less shipped than there were orders for over $70. Find the number of orders shipped at each rate.
A. $20 or less: 270; $20.01 to $70: 120; over $70: 120
B. $20 or less: 240; $20.01 to $70: 150; over $70: 120
C. $20 or less: 150; $20.01 to $70: 240; over $70: 120
D. The numbers cannot be determined from the given information.
Answer: C
Mathematics
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