Can anyone help me on this? IN NEED OF SOME HELP !

Answer:
Price of the notebook yesterday- $3.45
Price of the notebook today - $3.20
Decrease in price - $3.45-$3.20
= $ 0.25
Decrease % =
[tex] \frac{decrease}{total \: cost} \times \: 100[/tex]
[tex]100 \times \frac{0.25}{3.45} [/tex]
[tex]100 \times \frac{345}{25} [/tex]
4 × 345 = 1380%
ẞe ẞrainly