If you buy 3 shirts for $20 each, how much do you spend?

To find out how much is spent on 3 shirts when each shirt costs $20, you multiply the cost of one shirt by the number of shirts purchased. This involves a simple multiplication operation:

3 shirts * $20 per shirt = $60.

Therefore, the total expenditure for the 3 shirts is $60, making it the correct answer. The calculation captures the straightforward relationship between the unit price of the shirts and the total quantity purchased, leading directly to the total cost.