According to six-tenths-factor rule, if the cost of a given unit at one capacity is known, then the cost of similar unit with '' times the capacity of the first unit is approximately equal to __________ times the cost of the initial unit.
(A) n
(B) n0.6
(C) n0.4
(D) √n
(A) n
(B) n0.6
(C) n0.4
(D) √n