Nadal invests 5 dollars comma 678 at an annual interest rate of 4 point 5 percent for 6 years. For which variable can Nadal substitute the value 5 comma 678 in the simple interest formula? l is equal to p r t

In the simple interest formula I = p r t, p represents the principal, or the amount initially invested. Nadal invests $5,678, so he substitutes 5,678 for p. The correct choice is p.

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