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Word problemsArithmeticMiddle schoolabout 1:24

Simple interest on $1000 at 5% for 3 years: animated lesson

A narrated, step-by-step word problems video lesson with captions. Final answer: Interest earned = 150.

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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. The problem
Worked example
Simple interest on 1000 at 5% for 3 years
2. Steps, part 1
1. Read the problem
2. Identify the known values
3. $I = P\cdot\frac{r}{100} t$
  Write the equation
4. Solve for I
3. Steps, part 2
1. Result
4. The answer
$\text{Interest earned = 150}$
I = 150
5. Check
- Substituting I = 150 back into I = P · (r/100) · t balances both sides ✓

Transcript

The problem. Here is the problem: Simple interest on 1000 at 5 percent for 3 years. Principal 1000, simple interest at 5 percent per year for 3 years; the interest is unknown. Simple interest; P equals 1000, r equals 5 percent, t equals 3; solve for I.

Steps, part 1. Read the problem. Principal 1000, simple interest at 5 percent per year for 3 years; the interest is unknown. Identify the known values. Simple interest. Known: P equals 1000, r equals 5 percent, t equals 3. Unknown: interest earned (I). Write the equation. I equals P times (r/100) times t. Solve for I. I equals 1000 times 0.05 times 3.

Steps, part 2. Result. I equals 150.

The answer. So the answer is Interest earned equals 150. Substitute the known values into I equals P times (r/100) times t and isolate I. Keep units consistent (for example miles, miles per hour and hours).

Check. Substituting I equals 150 back into I equals P times (r/100) times t balances both sides, which checks out.

About word problems

Turn everyday situations about prices, speed, ages and interest into equations and solve them.

Simple interest on $1000 at 5% for 3 years: Animated Lesson