A

\[U+N+T\% \left(\frac{80UN}{8U-N}\right)\]

B

\[U+N+T\% \left(\frac{90UN}{8U-N}\right)\]

C

\[U+N+T\% \left(\frac{80U^2+N^2}{8U-N}\right)\]

D

\[U+N+T\% \left(\frac{85UN}{8UN-N}\right)\]

E

\[U+N+T\% \left(\frac{90UN}{8N-U}\right)\]