There is no p$2$ in the example. This is how I got to $42\mathrm{.}18$ for D$3$ through Infinity$---->3\mathrm{.}57/(\mathrm{.}10-\mathrm{.}03)/(1+\mathrm{.}10)^2.$ This leads to an answer of $47\mathrm{.}86$ not $46\mathrm{.}68$ as previously stated. The feedback from Chegg AI is agreeing with my answer, so I need to find the discrepancy.