If a shirt is 16 bucks and theres a sale 20% off how much will I buy the shirt for

You will buy the shirt for $12.80 after the 20% discount.

how did you do that?

To calculate the sale price of the shirt after a 20% discount, you would first find 20% of $16.

20% of $16 is 0.20 x $16 = $3.20

Then, you would subtract that amount from the original price of $16 to determine the sale price:

$16 - $3.20 = $12.80

Therefore, you would buy the shirt for $12.80 after the 20% discount.