In one of the building blocks at Oakland High there are 5 classes. Each class uses 2 whiteboards each and each whiteboard needs about 20ml of ink for a day's use. If ink costs 50 cents per ml, how much (in dollars) would it cost to use the boards for one day?
Each ml of ink costs 50 cents so 20 ml costs 20*50 = <<20*50=1000>>1000 cents
There are 2 whiteboards in each class so each class needs 2*1000 cents = <<2*1000=2000>>2000 cents
There are five classes in the block so they all need 5*1*2000 cents = <<5*1*2000=10000>>10000 cents
100 cents make a dollar so 10000 cents make 10000/100 = $<<10000/100=100>>100
#### 100