Sue's Sushi placed two orders with its fish supplier. One order was for 13 pounds of salmon and 7 pounds of tuna; the order totaled $206. The other order was for 10 pounds of salmon and 5 pounds of tuna; this order totaled $155. What is the cost for one pound of salmon and one pound of tuna?
A.
$7 salmon; $13 tuna
B.
$11 salmon; $9 tuna
C.
$8 salmon; $12 tuna
D.
$13 salmon; $7 tuna