Home › SAT › mathematics › problemsolvingdataanalysis › A store discounts an item by 20%, then 10% off t…
A store discounts an item by 20%, then 10% off the discounted price. Total effective discount is:
A28%
B30%
C32%
DNot 30%, less than 30%
Answer & Solution
Correct answer: A. 28%
After 20% off: price becomes 0.80×original. Then 10% off: 0.90 × 0.80 = 0.72 of original. Total discount = 1 − 0.72 = 0.28 = 28%. Important: successive percentage discounts DON'T just add.
Related questions
A line of best fit predicts $y = 50$ at a given $x$, and the actual data point at that $x$A scatterplot's line of best fit has equation $y = 2x + 5$. At $x = 10$, what is the prediIn a scatterplot of (hours studied, exam score), a line of best fit has slope 7. What doesThe density of a metal is 8 g/cm³. A cube-shaped sample has mass 64 g. What is the length Two flagpoles cast shadows at the same time. A 12-foot pole casts an 8-foot shadow. If a nA recipe uses dal and rice in the ratio 2:5. If 35 cups of rice are used, how many cups ofA shirt's price is increased by 25% and then discounted by 25%. The final price is what peThe price of a litre of petrol rose from ₹80 to ₹100. What is the percent increase?