OpenStax, Elementary Algebra 2e §3.2 Solve Percent Applications · Example 10 · Algebra · Algebra word problems
Solve Percent Applications · Example 10
Loren loaned his brother $3,000 to help him buy a car. In 4 years his brother paid him back the $3,000 plus $660 in interest. What was the rate of interest?
\begin{aligned}I & = & 660 \\ P & = & 3,000 \\ r & = &? \\ t & = & 4 \text{years}\end{aligned}
OpenStax, Elementary Algebra 2e · §3.2 Solve Percent Applications · Example 10
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