Answer :
$16.88
1) Gathering the data we have:
All 25% off
Original Price $25
Additional discount 10%
2) So we can write it out an equation where x is the final price:
[tex]\begin{gathered} 25\cdot(1-0.25)\cdot(1-0.1)=x \\ 25\cdot(0.75)\cdot(0.9)=x \\ 18.75\cdot(0.9)=x \\ x=16.875\approx16.88 \end{gathered}[/tex]Note that on the first parentheses, we have the first discount. The additional discount on the second parentheses and the original price $25.
3) Thus the answer is $16.88