Calculate the Original Jacket Price After a 30% Increase to $52

Percentage Increases with Original Value Problems

The price of a jacket is 52 dollars after a 30% increase.

What was the original price of the jacket?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Determine the initial price of the notebook
00:16 Mark the initial price as unknown X
00:40 The current price equals 130 percent of the original price
00:52 Write the equation
01:01 Convert percentages to fractions
01:22 Isolate X
01:45 Factor 52 into 4 and 13
01:50 Factor 130 into 13 and 10
01:55 Reduce wherever possible
01:58 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

The price of a jacket is 52 dollars after a 30% increase.

What was the original price of the jacket?

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given information and convert the percentage to a decimal.

  • Step 2: Apply the appropriate formula to represent the relationship between the original price and the increased price.

  • Step 3: Solve for the original price.

Now, let's work through each step:
Step 1: We are given a final price of 52andapercentageincreaseof3052 and a percentage increase of 30%. As a decimal, the 30% increase is <span class="katex">\( 0.30 .
Step 2: The formula for the new price is given by:
New Price=Original Price+(Original Price×0.30)\text{New Price} = \text{Original Price} + (\text{Original Price} \times 0.30)
This can be rearranged to:
New Price=Original Price×(1+0.30)\text{New Price} = \text{Original Price} \times (1 + 0.30)
Thus, New Price=Original Price×1.30\text{New Price} = \text{Original Price} \times 1.30.
Step 3: Substitute the given new price into the equation:
52=Original Price×1.30 52 = \text{Original Price} \times 1.30
Divide both sides by 1.30 to solve for the Original Price:
Original Price=521.3040 \text{Original Price} = \frac{52}{1.30} \approx 40

Therefore, the original price of the jacket was \40 \).

3

Final Answer

$40

Key Points to Remember

Essential concepts to master this topic
  • Formula: New Price = Original Price × (1 + percentage increase)
  • Technique: Divide final price by growth factor: 52 ÷ 1.30 = 40
  • Check: Verify answer: 40×1.30=40 × 1.30 = 52 ✓

Common Mistakes

Avoid these frequent errors
  • Subtracting 30% from the final price
    Don't calculate 52 - (30% of 52) = 52 - 15.6 = $36.40! This gives the wrong answer because you're subtracting 30% of the NEW price, not the original. Always divide the final price by the growth factor (1 + percentage).

Practice Quiz

Test your knowledge with interactive questions

Calculate 30 over 100 as a percentage:

FAQ

Everything you need to know about this question

Why can't I just subtract 30% from $52?

+

Because the 30% increase was calculated from the original price, not the final price! When you subtract 30% from 52,youreusingthewrongbaseamount.Thinkofitthisway:3052, you're using the wrong base amount. Think of it this way: 30% of 40 is 12,but3012, but 30% of 52 is $15.60.

What does the growth factor 1.30 actually mean?

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The growth factor represents the total amount after the increase. It's 1 (the original) + 0.30 (the increase). So 1.30 means the new price is 130% of the original price.

How do I handle different percentage increases?

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Always convert the percentage to decimal and add 1. For example:

  • 25% increase: growth factor = 1.25
  • 15% increase: growth factor = 1.15
  • 50% increase: growth factor = 1.50

What if the problem asks about a percentage decrease instead?

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For decreases, subtract the percentage from 1. A 20% decrease means the growth factor is 10.20=0.80 1 - 0.20 = 0.80 . The method stays the same: divide the final price by the growth factor.

Can I check my answer without a calculator?

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Yes! Use estimation. 40×1.3</strong>iseasiertocalculate:40 × 1.3</strong> is easier to calculate: 40 × 1 = 40,plus40, plus 40 × 0.3 = 12,so12, so 40 + 12=12 = 52 ✓

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