Respuesta :
0.32% is the answer and i need 20 characters to type this answer so dont mind this.
tip/cost times 100=%
2.67/12 times 100=0.2225 times 100=22.25%
tip was 22.25%
2.67/12 times 100=0.2225 times 100=22.25%
tip was 22.25%