use tool provided above. for pos coin staking reward is small and you must be selective when choosing coin.
It's not true, the interest will depend with how much coin that have been used by you to stake it in the network, basically it works like the more coin you stake it to the network and then the more reward you will get from your staking amounts. That depends on the value of your token.
i mean small in % from total coin you stake
That's masternode, many mn can give nice return but staking is different