What annual simple interest rate will increase johnson alexander's initial investment of $10,000 to $12,000 in five years?

The rate for such investment is 4% per annum. This will be computed as follows: $12,000 (Future value of money) less $10,000 ( Present value of money) is equal to $2,000 which will be then divided by 5 years and the it will give us the value of $400 per year. Then $400 will be divided by the $10,000 ( Present value of money) which gives us 4%.

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)

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