Solve Simple Interest Applications: exemplo 6.33

Problema e solução em inglês, como no livro original.

Find the simple interest earned after $3$ years on $$500$ at an interest rate of $6%.$

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Find the simple interest earned after $4$ years on $$800$ at an interest rate of $5%.$

Como foi?

Write the formula.	$I = P r t$
Substitute the given information. Remember to write the percent in decimal form.	$I = (500) (0.06) (3)$
Simplify.	$I = 90$
Check your answer. Is $90 a reasonable interest earned on $500 in 3 years?
In 3 years the money earned 18%. If we rounded to 20%, the interest would have been 500(0.20) or $100. Yes, $90 is reasonable.
Write a complete sentence that answers the question.	The simple interest is $90.

Write the formula.	$I = P r t$
Substitute the given information. Remember to write the percent in decimal form.	$I = (500) (0.06) (3)$
Simplify.	$I = 90$
Check your answer. Is $90 a reasonable interest earned on $500 in 3 years?
In 3 years the money earned 18%. If we rounded to 20%, the interest would have been 500(0.20) or $100. Yes, $90 is reasonable.
Write a complete sentence that answers the question.	The simple interest is $90.