so far I'm only able to calculate this for the very special cases of simple interest/discount, and compound rates
however, for more general cases, we'd need calculus since \delta_t = \frac{a`(t)}{a(t)}, which requires taking the derivative of of the accumulation function
so far I'm only able to calculate this for the very special cases of simple interest/discount, and compound rates
however, for more general cases, we'd need calculus since \delta_t = \frac{a`(t)}{a(t)}, which requires taking the derivative of of the accumulation function