A Company Has Three Products (X, Y, and Z) That

A company has three products (X, Y, and Z) that it sells, packs, and ships to its customers. Because the products have different sizes they also have different packing and shipping costs so we will use a new measure-a packing/shipping unit. Because Product Y is the smallest of the three products, we will assign it a value of 1 packing/shipping unit. Product X is twice as big as Product Y and Product Z is four times as big as Product Y. If, on a monthly basis, this company sells an average of 1,500 units of Product X, 800 units of Product Y, and 60 units of Product Z, how many packing/shipping units should it allocate to Product Z per month (to the nearest whole number) ?

A) 240
B) 424
C) 620
D) 800
E) 3,000