Section 11.104B.150 - Unitrusts-Unitrust rates(1) Except as otherwise provided in RCW 11.104B.180(2)(a), a unitrust rate may be: (a) A fixed unitrust rate; or(b) A unitrust rate that is determined for each period using:(i) A market index or other published data; or(ii) A mathematical blend of market indices or other published data over a stated number of preceding periods.(2) Except as otherwise provided in RCW 11.104B.180(2)(a), a unitrust policy may provide: (a) A limit on how high the unitrust rate determined under subsection (1)(b) of this section may rise;(b) A limit on how low the unitrust rate determined under subsection (1)(b) of this section may fall;(c) A limit on how much the unitrust rate determined under subsection (1)(b) of this section may increase over the unitrust rate for the preceding period or a mathematical blend of unitrust rates over a stated number of preceding periods;(d) A limit on how much the unitrust rate determined under subsection (1)(b) of this section may decrease below the unitrust rate for the preceding period or a mathematical blend of unitrust rates over a stated number of preceding periods; or(e) A mathematical blend of any of the unitrust rates determined under subsection (1)(b) of this section and (a) through (d) of this subsection.