Calculate Miss rate of L2 cache given global and L1 miss rates
You would only access the next level cache, only if its misses on the current one. Therefore the global miss rate is equal to multiplication of all the local miss rates.

0.0541    = L2 misses * 0.0913
L2 misses = 0.0541/0.0913 = 0.5926
L2 miss rate = 59.26%


In your answer you got the % in the wrong place.