Problem $14-7($Algo$)$

Based on the BOM shown below,

How many of part D will be needed if $45$ units of end item A are needed? How many of part F$?$

$\begin{array}{cc}\text{N}\text{u}\text{m}\text{b}\text{e}\text{r}of\text{p}\text{a}\text{r}\text{t}\text{s}\text{n}\text{e}\text{e}\text{d}\text{e}\text{d}& ?\\ \text{N}\text{u}\text{m}\text{b}\text{e}\text{r}of\text{p}\text{a}\text{r}\text{t}\text{s}\text{n}\text{e}\text{e}\text{d}\text{e}\text{d}& Ds\end{array}$