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First Year maths · G.2 · Simple interest

Simple interest: find the total amount

Use interest = principal × rate × time, with the rate as a percent per year.

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  1. $900 is invested at 5% simple interest per year for 1 year. How much money is there at the end?

    Answer: $945.00

  2. $800 is invested at 2% simple interest per year for 1 year. How much money is there at the end?

    Answer: $816.00

  3. $500 is invested at 2% simple interest per year for 1 year. How much money is there at the end?

    Answer: $510.00

Tip: Use interest = principal × rate × time, with the rate as a percent per year.

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