What single decimal multiplier would you use to decrease by 14% followed by a 9% decrease?

First assume that you have 100% before you decrease.

When you apply the first decrease you have 86% left (100% - 14% (100%)).

The 9% additional decrease is when it becomes difficult. But we can still use the same strategy as before.

86% - 9% (86%) = 78.26%

Answer: 78.26%