Respuesta :
total cost = hair style + tip
total cost = 18 + 20% × 18
total cost = 18 + 0.2 × 18
total cost = 18 + 3.6
total cost = 21.6
Christian paid $21.6
total cost = 18 + 20% × 18
total cost = 18 + 0.2 × 18
total cost = 18 + 3.6
total cost = 21.6
Christian paid $21.6