20. Reliability of Computer Chips The percentage of a certain brand of computer chips that will fail after t years of use is estimated to be P(t) = 100 (1 - e-0.1t a. What percentage of this brand of computer chips are expected to be usable after 3 years? b. Evaluate lim P (t). Did you expect this result?54. Credit Card Delinquency Rate The credit card delinquency rate stood at 5.7% at the beginning of 2010. It was declining at the rate of R(t) = 0.150975e-0.0275t (0