If an amount grows to 5 times the initial value at 5% interest. At what rate wo…

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If an amount grows to 5 times the initial value at 5% interest. At what rate would it increase to 12 times the initial value?

Simple interest refers to interest that:

The Interest received at 15% per annum simple interest after 3 yrs is $630. What was the principal?

A certain amount earns simple interest of $1750 after 7 years. Had the interest been 2% more, how much more interest would it have earned ?

You have $10,000 to invest and your broker has offered you 17% simple interest.

You just inherited $30,000 and are considering an investment that will earn 8% simple interest per year. 

What is the total amount accumulated after five years if you invest $2000 today with simple interest of 9%? 