Working out how much time has increased by in %

Question

I have two time values:

Previous 3d 5h

Now 5d 7h

How can I work out how much it has changed by in terms of percentage.

Thanks

Answer 1

Previous: $77$ hours, now: $127$ hours.

Thus, $127/77=1+50/77$, so this is an increase of $50/77\approx 65\%$.