Question 1017007
2.5x + 1.75y = 200
.
Any amounts that fit there will work.
Let's say you want only cedar.  Then you would have 200/2.5 = 80 feet of cedar
Maybe you don't mind the pine.  200/1.75 = 114.29'
More likely, you might use pine for the bottom and cedar for the arms.  If the bottom needs 100' of pine, you'd have spent 100 x 1.75 = $175 on pine, leaving you $25 for cedar -- 25/2.5 = 10 feet.
.
If you're making them to sell, it's worth buying the better quality.