US health-care expenditures in 2010 reached 2.47 trillion dollars.It is difficult to predict future health-care costs.One prediction is that in the near term, they will grow by 6.5% each year.Assumingthatthis growth rate continues, choose the formula that gives health-care expenditures as a function of time.

A. 2.47 + 0.065t

B. 2.47(0.065)^t

C. 2.47t

D. 2.47(1+0.065)^t