SAT Question 1c2f50a6: Percentages answer and explanation with Desmos solution

Choice D is correct. It's given that the original price of the jacket has been reduced by $20\%$. Multiplying the original price, $$50$, by $20\%$ gives the amount, in dollars, that the price of the jacket is reduced by: $$50$ $\times 0.20=10$. Subtracting this value from the original price results in the sale price of the jacket: $$50$ $-10=$ $$40$.