An old computer program which computes the nth Fibonacci number takes 0.05 microseconds
(us) to compute the 1st number. After this, each number takes twice as long as the previous
number to compute. A computer engineer designs a new program which takes 0.8 us to
compute the 1st Fibonacci number. After this, each number takes 0.6 us longer than the
previous number to compute. How much longer in microseconds does it take the old program to
compute the 8th Fibonacci number compared to the new program?