Two customer went to a post office to buy postcards and large envelopes. Each postcard costs the same amount, and each large envelope costs the same amount. . The first customer paid $12 for 14 postcards and 5 large envelopes. . The second customer paid $24.80 for 10 postcards and 15 large envelopes. What was the cost of each large envelope? Q) $1.42 b.) $0.35 c.) $1.15 d.) $0.63