Prep DS 2-7+2-200

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 >=7.30         答案：B

200.
    19224-!-item-!-187;#058&012506

If d is a positive integer and f is the product of the first 30 positive integers, what is the value of d ?

(1) 10^d is a factor of f.

(2) d > 6              答案：C

求达达们解答  完全没思路~