Question

4. Jane invested an amount in an account that pays simple interest.
The interest rate is 2% per year. The money was invested for 9 months and she earned $7.50.
What was the principal she invested?

Answer 1

Resposta:

7,50 ÷ 9 = 0,83

A cada mês ela ganhava $ 0,83.

0,83 × 12 = 12,96

A cada ano ela irá receber 12,96, se ela recebe 2% do que investiu por ano logo:

100% ÷ 2% = 50%

12,96 × 50 = 645

Ela investiu $ 645,00

I'm not sure, if that's what I had to do, because I used the Google translator to read the question; -;

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7.50 ÷ 9 = 0.83

Each month she earned $ 0.83.

0.83 × 12 = 12.96

Each year she will receive 12.96, if she receives 2% of what she has invested per year soon:

100% ÷ 2% = 50%

12.96 × 50 = 645

She invested $ 645.00