I would say 25% because it’s not half of that 3 is not half of 24 so it can’t be 50 so 25 would be your best choose
Bearing in mind that an isosceles triangle has twin sides, and coming out of the vertex they make twin angles at the base, check the picture below.
A. C(n)=10n+125
cost×number of buttons is equal to 10 cents times the number of buttons, plus the $125 cost of the button machine