0.0168% is what that percentage is, though that doesn't equate to the actual yearly interest rate. On a calculator do the following (this may well be the idiots way, it's just how it was taught to me):
low number / high number x 100 = the percentage
eg 25 poker hands played, you win the pot 7 times, is 7 / 25 x 100 = 28%, if working out your win percentage of poker hands played
$30 earnings from $100 customer spend at a revshare cam company is:
30 / 100 x 100 = 30% (obviously)
so 210 / 1250000 x 100 = 0.0168%