Question

.

Answer 1

After first bounce h=6x80
After second bounce h=6x(6x80)
After third bounce h=6x(6)(6x80)
So the general formula is after the nth bounce
h=\[6^{n}x 80\]

Answer 2

I'd say that 60% is 6/10, so we'll multiply by 6/10 each time.