Brandi earned $78 in interest after one and one half years on an account that paid 7.5% simple interest annually.

Brandi earned $78 in interest after one and one half years on an account that paid 7.5% simple interest annually. Use the formula I = Prt to find Brandi’s principal balance. Round to the nearest hundredth.
$69.33
$87.75
$693.33

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