Answer: 20%
Step-by-step explanation:
Total number of buttons Emily has =75
She gives button to Jake=15
The percent of her button she give to Jake= \(\frac{\text{Buttons she gave}}{\text{Total buttons}}\times100\)
\(=\frac{15}{75}\times100\\\\=\frac{1}{5}\times100\\=20\%\)
Hence, she gave 20% of the total button she has to Jake.