Aclub decides to sell t-shirts for $15 as a fundraiser. it cost $20 plus $9 per t-shirt to make the t-shirts. write and solve an equation to find how many t-shirts the club needs to make and sell in order to profit at least $152?
a. 15x - (9x+20) greater than or equal to 150; x greater than or equal to 28.33
b. 15x-9x + 20 greater than or equal to 150; x greater than or equal to 20
c. (8x+20) -15x greater than or equal to 150; x greater than or equal to 20
d. 15x -9 (x+20) greater than or equal to 150; x greater than or equal to 20