A group of cells is continuously growing at a rate of 80% per day. If there are 500 cells now, how long will it take to grow 5000 cells?

Question

Using the formula I think A=P (1+r) ^t or A=Pe^rt

Answer 1

5000=500(1+80%)^t

10=(1.8)^t

log(10)=log((1.8)^t)

1=t*log(1.8)

1=t*0.2552725051

t=1/0.2552725051

t=3.917 days

Answer 2

5000=500(1+80%)^t

10=(1.8)^t

log(10)=log(1.8)^t

1=tlog(1.8)

t=1/log(1.8)

t=1/(0.2552725051)

t=3.917 days