On monday, jeff bought a t-shirt for 40% off
the regular price of $16.00, not including tax. the
next day, the t-shirt that jeff bought was marked
down to 75% off its regular price. how much
would jeff have saved, not including tax, if he had
waited until tuesday to buy the t-shirt?

The answer is: $ 5.6

Explanation:

On Monday, Jeff bought a shirt with a 40% = 0.4 discount. The regular price of $ 16.00, excluding taxes.

He paid for the shirt without taxes: $ 16.00 - ($ 16.00 x 0.4) = 16.00 - 6.4 = $ 9.6

The next day, the shirt Jeff bought was reduced to 75% = 0.75 of his regular price.

The next day the shirt would cost without taxes: $ 16.00 - ($ 16.00 x 0.75) = 16.00 - 12 = $ 4

How much would Jeff have saved, If what he paid we subtracted what the shirt would cost the next day the result would be: $ 9.6 - $ 4 = $ 5.6

The answer is: $ 5.6