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Mathematics, 23.06.2021 18:20 ann6083

John invested $30000 in the bank for 4 years. At the end of the period, he had $42520. Calculate
a. the interest earned
b. the rate per annum at which simple interest was earned to 1 decimal place.

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John invested $30000 in the bank for 4 years. At the end of the period, he had $42520. Calculate
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