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Answer:
 P = 50,000
 r = 0.08
 i = 0.02
 K = 4
 n = 20
 t = 5
Explanation:
In this formula, r is the annual interest rate, 8% or 0.08. K is the number of times the interest is compounded in a year. Since interest is compounded quarterly, K = 4.
 r = 0.08
 i = r/K = 0.08/4
 i = 0.02
t is the number of years interest is compounded, so ...
  t = 5
 n = Kt = 4·5
 n = 20
P is the principal amount invested:
 P = 50,000