Question

Difficulty: MediumDiscounts and Sale Prices

Determine the total amount saved and the final pre-tax price for the successive discounts described below.

Answer:An auto parts store lists a set of all-terrain tires for a regular price of $800\$800. During a holiday event, the tires are marked down by 15%15\%. A customer applies a military discount that takes an additional 10%10\% off the already reduced sale price. The customer saves a total of $【188】\$【188】 from the regular price, resulting in a final pre-tax price of $【612】\$【612】.

Answer

The total savings is $188\$188, and the final price is $612\$612.
To find successive discounts, each percentage must be applied to the current reduced price. First, a 15%15\% discount on $800\$800 reduces the price by $120\$120, making it $680\$680. Then, a 10%10\% discount is applied to the $680\$680 sale price, which reduces it by another $68\$68. The final price is $680−$68=$612\$680 - \$68 = \$612. The total amount saved is the sum of both discounts, $120+$68=$188\$120 + \$68 = \$188.

Step-by-Step Solution

1
Calculate the first discount amount.
$800×0.15=$120\$800 \times 0.15 = \$120
Find the dollar value of the initial 15%15\% holiday mark-down.
2
Calculate the intermediate sale price.
$800−$120=$680\$800 - \$120 = \$680
Subtract the first discount from the regular price to find the new base price for the second discount.
3
Calculate the second discount amount.
$680×0.10=$68\$680 \times 0.10 = \$68
Apply the 10%10\% military discount to the intermediate sale price, not the original price.
4
Determine the total savings and final price.
Total savings: $120+$68=$188\$120 + \$68 = \$188. Final price: $800−$188=$612\$800 - \$188 = \$612.
Combine both discount amounts to find the total saved, and subtract from the original price to find the final price.

Key Concept

Calculating successive discounts requires applying the second percentage to the newly reduced price, rather than adding the percentages together.
Estimated Time:1m 30s
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