Most Helpful Guy
Yes you can - It is your number of MHOs divided by the opinions you have given on questions where MHO is awarded after you give your opinion multiplied by 100 that gives MHO %.
Don't worry though you would have to hit a real long spell of answering questions and not getting MHOs to drop.
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Most Helpful Girl
MHO% can decrease or increase depending on how many MHOs you are awarded compared to how many opinions you have posted. The more MHOs you get, the higher your MHO% will be.