Write a system of equations for the problem and then solve using any method you have studied. At an office supply store, Mary buys seven packages of notebook paper and four pens for $7.30. At the same store, Sue buys two packages of notebook paper and 19 pens for $6.55. What was the cost of each of these items?
A. notebook paper $0.25 each; pen $0.90 each
B. notebook paper $0.45 each; pen $1.00 each
C. notebook paper $0.90 each; pen $0.25 each
D. notebook paper $1.00 each; pen $0.45 each
E. notebook paper $0.95 each; pen $0.30 each
Answer: C
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