Consider the question. K-numbers are positive integers with only 2's as their digits. For example, 2, 22, and 222 are K-numbers. The K-weight of a number n is the minimum number of K-numbers that must be added together to equal n. For example, the K-weight of 50 is 5, because 50 = 22 + 22 + 2 + 2 + 2. What is the K-weight of 750?
Options:
(A) 10
(B) 11
(C) 12
(D) 13
(E) 15
 What is the step-by-step reasoning process to arrive at the answer: (E)?
750 = 3*222 + (22*3) + 9*2
K weight of 600 = 3 +3+9 = 15