Qu. 1 counts as 40% towards my semester grade, Qu. 2 counts as 40%, &Midterms counts as 20%, help me calculate?

If I have an 88% for my Qu.(quarter) 1 grade and an 87% for my Qu. 2 grade, then what grade will I need to recieve on my midterms to that I can get an A (at least 90%) for my overall semester grade?