Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
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?

### Response:
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 5 classes in the block so they all need 5*2000 cents = <<5*2000=10000>>10000 cents
100 cents make a dollar so 10000 cents make $100
#### 100