A printing company is analyzing the cost of their greeting cards. The cost of the greeting cards depends on the number of greeting cards purchased. This relationship was
graphed on a line that passes through the points (5, 12.50) and (3,7.50).
Interpret the meaning of the slope of the line.
А. For every $1 spent, you will receive 1.25 greeting cards.

B. For every $2 spent, you will receive 5 greeting cards.

С. For every $5 spent, you will receive 2 greeting cards.

D. For each additional greeting card you purchase, you will spend $0.40.