A manufacturer of light-emitting diode (LED) lights has tested its lights and found that the percent chancePthat a light will fail afterthrsof use can be approximated by the following.

P= 100

1

2

	t/40,000

(a)What is the percent chance that one of the company's LED lights will fail after30,000hrs? Round to the nearest tenth. %(b)In how many hours will the chance of an LED light failing reach20%? Round to the nearest thousand. hr