By far, the most common cause of secondary amenorrhea is pregnancy. The test you took was negative, but I would repeat it to be sure. A second common cause of secondary amenorrhea is weight loss. If you have been aggressively dieting lately, or engaging in a rigorous exercise plan, your periods can stop.
Likewise, if you made millions in 2017, whether from cryptocurrency, your job, or any other source, you are probably at the highest tax bracket, currently 39.6%. Itâs important to understand that these are just marginal rates applicable to you as an individual, and that assets (like cryptocurrency) often qualify for a better rate, known as the capital gains rate.
The worldwide average top corporate income tax rate (accounting for 173 countries and tax jurisdictions) is 22.9 percent, 29.8 percent weighted by GDP. By region, Europe has the lowest average corporate tax rate at 18.7 percent (26.1 percent weighted by GDP). Africa has the highest simple average at 28.77 percent. Larger, more industrialized countries tend to have higher corporate income tax rates than developing countries.