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PercentagesArithmeticMiddle schoolabout 1:22

Calculate 15% tip on $60: animated lesson

A narrated, step-by-step percentages video lesson with captions. Final answer: Tip = 9 (total with it = 69).

Video with a synthetic English voice and captions. Pick another language for subtitles in that language, or open the interactive version.

Video narrated by a synthetic voice (Piper TTS, en_US-ljspeech-high voice (LJ Speech dataset, public domain)); the steps come from our maths engine and the answer was checked independently. Download MP4 (0.5 MB) · Captions (WebVTT)

Steps on screen

  1. 1. The problem
    Worked example
    15% tip on 60
  2. 2. Steps, part 1
    1. Read the problem
    2. Identify the known values
    3. new=old×(1+p100)\text{new} = \text{old}\times\left(1 + \frac{p}{100}\right)
      Write the equation
    4. Solve for new
  3. 3. Steps, part 2
    1. Result
  4. 4. The answer
    Tip = 9 (total with it = 69)\text{Tip = 9 (total with it = 69)}

    new = 69

  5. 5. Check
    • Substituting new = 69 back into new = old × (1 + p/100) balances both sides ✓

Transcript

The problem. Here is the problem: 15 percent tip on 60. The original price is 60 and it increases by 15 percent, so the percent change is 15 percent. Percent increase or decrease; old equals 60, p equals 15 percent; solve for new.

Steps, part 1. Read the problem. The original price is 60 and it increases by 15 percent, so the percent change is 15 percent. Identify the known values. Percent increase or decrease. Known: old equals 60, p equals 15 percent. Unknown: new value (new). Write the equation. new equals old times (1 plus p/100). Solve for new. new equals 60 times (1 plus 0.15).

Steps, part 2. Result. new equals 69.

The answer. So the answer is Tip equals 9 (total with it equals 69). Substitute the known values into new equals old times (1 plus p/100) and isolate new. Keep units consistent (for example miles, miles per hour and hours).

Check. Substituting new equals 69 back into new equals old times (1 plus p/100) balances both sides, which checks out.

About percentages

Percent of a number, what percent one number is of another, the whole from a part, and percent change.

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Calculate 15% tip on $60: Percentages Step-by-Step Lesson