Interest calculations

1. Find the simple interest on $800 at 5% p.a. for 4 years.
2. A loan of $1200 is taken at 8% p.a. simple interest for 18 months. Find the total to repay.
3. Find the compound interest on $600 at 10% p.a. for 2 years.
4. Which earns more after 3 years: $1000 at 5% simple, or $1000 at 5% compound? By how much?

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