Answer:
8 years approximately
The problem (I'm assuming is):
Solve
.
I put a t in the problem where I suspected it in went.
Step-by-step explanation:

Divide both sides by 100:


Rewrite in logarithm form.

Divide both sides by 0.05:

Put left hand side into calculator:


So about 8 years if I wrote down the equation correctly.
140 is a composite number. Factor pairs: 140 = 1 x 140, 2 x 70, 4 x 35, 5 x 28, 7 x 20, 10 x 14. Factors of 140: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140. Prime factorization: 140 = 2 x 2 x 5 x 7, which can also be written 140 = 2² x 5 x 7
There are extra periods so I’m not exactly sure but I think it’s 00.96