SAT Question 5267c3c7: Percentages answer and explanation with Desmos solution

Choice B is incorrect. The result of increasing the quantity $15$ by $400\%$ is $75$, not $60$.

Choice C is incorrect. The result of increasing the quantity $240$ by $400\%$ is $1,200$, not $60$.

Choice D is incorrect. The result of increasing the quantity $340$ by $400\%$ is $1,700$, not $60$.