May you please solve for question 17 and 18v

Question 17 1 pts An analyst estimates that the computers his company just bought will depreciate at a rate of 25% per year. At this rate, approximately how long will it take a computer to depreciate to 30% of its original value? O 4 years O 2 years 15 years 10 years Question 18 1 pts A fossil is found that contains 10% of the amount of carbon-14 found in a living being. About how old is the fossil? 19,200 Years 13,500 Years 20,700 Years 15,300 Years