t-shirts
I paid $10 a shirt for 200 running shirts. At a race I sold 1 for $20 each, and 2 for $30. After the race I had $780, and 151 shirts left. How many shirts did I sell for $20 and how many shirts did I sell for $15?
Bonus:
If I reduced the price of all shirts to $15, how many more shirts would I need to sell to break even?
