One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where C = 6.5x + 8.5y. Is x<0.8?
(1) y>0.15
(2) $$C\ge7.30$$
应版权方要求,不支持在线看题功能,感谢您的理解。