The simple interest I on an investment of p dollars at an interest rate r for t years is given by I=prt. Find the time it would
take to earn $900 in interest on an investment of $21,000 at a rate of 4.6%. Also: Whats your name man? A. Alexander Hamiloan B. Alex Hamilham C. Alexander Hamilton D. Alexander Lukoshanko
You have the formula written correctly, so now we just need to fill it in with what we have. Our principle, or initial investment, is 21,000; our interest rate of 4.6% as a decimal (always as a decimal!) is .046; and our interest earned is 900. We need to find t. Setting up with what we have:
