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I do not understand sol/s. what is their relationship to mh/s?.

Hey guys I am new to zcash. I have mined ethereum so i am familiar with mining and cryptocurrency technology. In ZCASH i have discovered everybody is addressing their mining rate my the keyword “sols/s”. in ethereum if i have to plan my ROI i would calculate the hashrate of all GPUs so that i know which one will give me how much profit but in zcash everyone is writing "my xxx GPU is making.