Problem $2.$

Given a concrete beam $(b=10in.$;$h=25in.)$ with flexural reinforcement at the bottom, the transformed

moment of inertia is $I_{tr}=14,740i{n}^4,$ and the location of the neutral axis from top of the beam is $\frac{?}{\text{b}\text{a}\text{r}}(y)=13\mathrm{.}2in.$

Assuming an elastic behavior, what is the maximum tensile stress in the concrete $($bottom face$)$ when $M=$

$50$ kip$-$ft$?$

$($I just re$-$did the math and got $5\mathrm{.}76$ followed the same steps but multiplied $11\mathrm{.}8$ by $12$ in since it is $11\mathrm{.}8$ is in$,$ in$-$ft$,600$ x $141\mathrm{.}6$ divided by $14740$ equals $5\mathrm{.}76.$ Anything will help or explaination to $,$ thank you$)$