Show work! suppose that a(t)1 0.15t. find the effective rate of interest earned in the 6th time period (i. e. from time t-5 to t-6) suppose that a(t) (1.15). find the effective rate of interest earned in the 6th time period (i. e. from time t-5 to t-6) suppose that a(t)-10.15t2. find the effective rate of interest earned in the 6th time period (i. e from time t-5 to t-6)