Money in a piggy bank stays the same. Money in a bank savings account earns interest — the bank pays you for keeping it there. With simple interest, I = P × R × T ÷ 100, where P is the money put in, R the rate per year and T the years.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
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🏁 Lesson 23 test
20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
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