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Percents  Mentally Calculate DiscountRetailers advertise big sales and deep discounts to lure you into their stores. Once you enter the stores and see 20%, 25 %, 60%, and even 75% off, adrenaline begins to flow as you shop for bargains. You find the perfect gift or bargain. Then, you wonder how much will I save? How much should I expect to pay at the register? Generally, you do not have a calculator or pencil and paper in your hand. So, let’s look at a few ways to mentally calculate the discount and sale price. First example: 20% off of $14.99 game What is the discount or amount saved? 1) Round $14.99 to the nearest dollar  $15.00 2) Calculate 10% of $15.00 by moving the decimal to the left once  $1.50 3) Then double $1.50 to get 20%  $3.00 discount or amount saved. You will save $3.00. 4) To determine the approximate sale price – subtract the savings from the original price $15.00  $3.00 = $12.00 Second example: 25% off of $35.00 pants What is the discount or amount saved? 1) Calculate 10% of $35.00 by moving the decimal to the left once  $3.50 2) Then double $3.50 to get 20%  $7.00 3) To calculate an additional 5%, take ½ of 3.5  $1.75 **see note 4) Add $7 and $1.75  $8.75 or round to $9.00 discount or amount saved. You save ~ $9.00. 5) To determine the approximate sale price – subtract the savings from the original price $35.00  $9.00 = $26.00 approximate sale price **If taking half of $3.50 is confusing, then round $3.50 to the nearest dollar.  $4.00. Take ½ of $4.00 $2.00 this is ~ 5% of $35.00 Add $2 and $7  $9.00 savings Third example: 60% off of $80.00 What is the discount or amount saved? Calculate 10% of $80.00 by moving the decimal to the left once  $8.00 Then, think 10%  $8.00 10%  $8.00 10%  $8.00 10%  $8.00 10%  $8.00 10%  $8.00  60%  $48.00 In short, 10% of $80.00 is $8.00, therefore mentally multiply $8.00 times 6 to get $48.00 discount. Round to the nearest dollar  $50.00 You save ~ $50.00. To determine the approximate sale price – subtract the savings from the original price $80.00 – $50.00 = $30.00 Buy it! Fourth example: 75% off $130.00 What is the discount or amount saved? 1) Calculate 50% or half of $130.00  $65.00 2) Next determine 25% of $130.00  $32.50** 3) Add $32.50 and $65.00 Total discount or amount saved is 97.50 or ~ $100.00 4) To determine the approximate sale price – subtract the savings from the original price $130.00 – $100.00 = $30.00 approximately Buy it! Call and text your friends about the great sale. **How does 25% of $130 equal $32.50? Since, 50% or half of $130.00  $65.00 and 25% is half of 50% Then 25% is half of $65.00 which is 32.50 or Mentally calculate 10% of $130.00 by moving the decimal to the left once  $13.00 Add another 10% > $13.00 Add 5% by taking half of $13.00  6.50 Thus $13.00 + $13.00 + $6.50 = $32.50
Content copyright © 2013 by Beverly Mackie. All rights reserved.
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