Anabelle borrowed Php 12,000 that bears a simple interest. She has fully paid Php 12,750 after 3 months. How much interest did she pay?

Advanced Engineering Mathematics
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ISBN:9780470458365
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Chapter2: Second-order Linear Odes
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1. Anabelle borrowed Php 12,000 that bears a simple interest. She has fully paid Php 12,750 after 3 months. How much interest did she pay?

2. Brian borrowed from his friend, Mark, Php 9,000. He repaid the Php 9,600 after 15 months. What was the simple interest rate?

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