A = P(1+r%)ⁿ , where P = initial value, A= new value, n = number of years and r% is the growth or depreciation rate, depending on its sign: If it's a depreciation, the formula becomes:
The formula is A=p (1-r)^t A future value 500 P current value 15000 R rate of depreciation 0.3 T time? 500=15000 (1-0.3)^t Solve for t Divide both sides by 15000 500/15000=(1-0.3)^t Take the log for both sides Log (500/15000)=t×log (1-0.3) Divide both sides by log (1-0.3) T=(log(500÷15,000)÷log(1−0.3)) T=9.5 years round your answer to get 10 years
If you divide 4/5 you get 80%. Then if you divide 4/9 you get .4444444 which means Nicole's friend only ran 44% of Nicole's distance. That's what i got from there. You might have to multiply more, but that's all I've got from the information you gave me