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Exemplo 3.20 de Elementary Algebra, 3.2 Solve Percent Applications
Problema e solução em inglês, como no livro original.
Nathaly deposited $12,500 in her bank account where it will earn 4% interest. How much interest will Nathaly earn in 5 years?
Resolva no papel primeiro. Depois abra a solução um passo de cada vez e pare assim que conseguir terminar sozinho.
| Step 1. Read the problem. | |
| Step 2. Identify what we are looking for. | the amount of interest earned |
| Step 3. Name what we are looking for. Choose a variable to represent that quantity. |
Let the amount of interest. |
| Step 4. Translate into an equation.
Write the formula. Substitute in the given information. |
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| Step 5. Solve the equation. | |
| Step 6. Check: Does this make sense?
Is $2,500 a reasonable interest on $12,500? Yes. |
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| Step 7. Answer the question with a complete sentence. | The interest is $2,500. |
O Try It do livro logo depois deste exemplo: mesma ideia, outros números. Só a resposta é dada.
Areli invested a principal of $950 in her bank account with interest rate 3%. How much interest did she earn in 5 years?
Como foi?