Two customers went to a post office to buy posicaids and large enkelapes Fast posrcard costs the same amount, and each large envelope costs the same amount
The first customer paid $12 for 14 postcards and 5-large enveldoles
The second customer paid $24.80 for 10 postcards and 15-arge envelopes
What was the cost in dollars of each large envelope?
A $1.42
B $0.35
C $1.15
D $0.63