This math topic focuses on calculating the percent growth of money, including principles and varying interest rates, specifically in 5% increments. The skills practiced involve determining the final amount of money after applying percentage increases as interest on different principal amounts. Each problem presents a principal sum and an interest rate, and the task is to compute the final increased sum, offering a practical application of elementary percent and interest calculations often seen in basic financial and economic contexts.
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Calculate the final amount when it changes by a percentage
$80 principle grows by 15% interest