3000 * 1.0935 ^t = 6000 * 0.8538 ^t | : 3000
1.0935 ^t = 2 * 0.8538 ^t | : 0.8538 ^t
1.0935 ^t / 0.8538 ^t = 2
( 1.0935 / 0.8538 ) ^t = 2
1.281 ^t = 2 | ln ( )
t * ln ( 1.281 ) = ln ( 2 )
t = 2.8
Probe
3000 * 1.0935 ^2.8 = 6000 * 0.8538 ^2.8
3853 = 3853