If the simple interest on $3,000 for 9 years is $2,430, then what is the interest rate?

The formula for simple interest is I=prt where I is the interest, p is the principle, r is the rate, and t is the time. Plugging in what you know, you get (2430)=(3000)r(9). Simplifying, you get 2430=27000r. Dividing both sides by 27000, you get r=0.09. This means that the interest rate is 9%.

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Ican't do any of the other stuff, but i can get you started. the answer, i believe, is $2.50.

Its d so thats how it would would back from 1.0 form three four two