assume 1 u.s dollar=7.80 h.k dollars if a supplier quotes us a price of 23.40 h.k each,what is our cost in u.s dollars?

Answer:
divide it
Step-by-step explanation:
divide because one $ = 7.8 h.k that is your key.(what you multiply, add, subtract, or divide by.)
now just divide23.4 by 7.8 and get 3.