use the basic proportion p/100=a/b to solve the following problem for the unknown quantity. round your answer to the nearest hundredth if necessary

Using the basic proportion, the A value is 850 and the B value is 939, then:
[tex]\begin{gathered} \frac{P}{100}=\frac{850}{939} \\ P=\frac{850}{939}\times100 \\ P=0.9052\times100 \\ P=90.52\text{ \%} \end{gathered}[/tex]