SAT Question 98818acf: Percentages answer and explanation with Desmos solution

31$.It’sgiventhatthenumberofaudiobooksinthelibraryincreasedby＄131\%$ from last year to this year. Converting ＄131 %$toadecimalyields＄1.31$. It’s also given that the number of audiobooks in the library last year was $n$, where $n$ is a constant. It follows that the number of audiobooks in the library this year can be represented by $n$ plus $131\%$ of $n$, or $n+1.31n$. Combining like terms in this expression yields ＄2.31 n$.Sincethenumberofaudiobooksinthelibrarythisyearisrepresentedas$b n$,where$b$isaconstant,itfollowsthatthevalueof$b$is$2.31$.