SAT Question 7cab9fe1: Percentages answer and explanation with Desmos solution

Choice A is correct. The result of increasing a positive quantity $w$ by $x\%$ can be represented by the expression $\left(1+\frac{x}{100}\right)w$. Therefore, the result of increasing a positive quantity $w$ by $43\%$ can be found by substituting $43$ for $x$ in the expression $\left(1+\frac{x}{100}\right)w$, which gives $\left(1+\frac{43}{100}\right)w$, or $1.43w$. Thus, the expression $1.43w$ represents the result of increasing a positive quantity $w$ by $43\%$.