Question

On Friday Henry bought a CD for 40% off the regular price of $22.00, ot including tax. The next day the CD that Henry had bought was marked down to 65% off its regular price. How much more money would Henry have saved, not including tax, if he had waited until Saturday to buy the CD?

Answer 1

The Friday price is $P_{friday} = (1 - 0.40) \cdot P_{regular} = 0.60 \cdot \$22 = \$13.2$.

The Saturday price is $P_{saturday} = (1 - 0.65) \cdot P_{regular} = 0.35 \cdot \$22 = \$7.7$.

So, he could save $\Delta P = P_{friday} - P_{saturday} = \$13.2 - \$7.7 = \$5.5$.

Answer: \$5.5.