Michigan Gov. Gretchen Whitmer on Tuesday signed a new 24% tax on marijuana sales between producers and dispensaries, saying the measure will help fund her administration’s long-promised effort to repair the state’s crumbling roads. The tax, which applies to wholesale marijuana transactions, is expected to generate roughly $420 million annually — money that will go toward Whitmer’s $1.8 billion road-funding plan. Whitmer’s first attempt to fix Michigan’s roads through a 45-cent gas tax increase