SOLUTION: The sales of a mature product (one which has passed its peak) will decline by the function. S(t) = S0e^(-at), where t is time in years. Find the sales after 25 years if a=0.2

Question 277207: The sales of a mature product (one which has passed its peak) will decline by the function. S(t) = S0e^(-at), where t is time in years. Find the sales after 25 years if
a=0.2 and S0=94,600
I tried it in this form
94600e^(0.2*25)
And my numbers aren't coming up right in the calculator. Did I not set them up right, or is there a specific way to type this correctly. Please help I really want to understand this!!
Answer is 637

Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
the exponent in the equation is negative, right?

94600 * e^(-5) = 637 (approx)

e is the base for natural logarithms ___ it should be a key on your calculator
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