Question 1087381
Yes, you're on the right track.
Do the multiplication,
{{{(3/4)(4/5)(5/6)(6/7)(7/8)(8/9)(9/10)=3/10}}}
{{{(4/5)(5/6)(6/7)(7/8)(8/9)(9/10)=4/10}}}
So then the whole thing equals,
{{{log((0.3))/log((0.4))=1.314}}}