It’s an annual ritual in Michigan: The state proclaiming how much cash the lottery is pouring into schools. Gov. Gretchen Whitmer recently announced that for the seventh year in a row, the lottery contributed more than $1 billion to the School Aid Fund. But buying a $1 scratch-off doesn’t mean you’ve just pumped $1 into school coffers. In fact, Michigan schools get about a fourth of that — or less, depending how you count it. For every dollar spent on a lottery ticket, 63 cents goes toward