Answer:
10%
Step-by-step explanation:
We have been given that the manager of a store orders model railroad sets that cost $390 and sells them for $429.
We will use markup % formula for our given problem.
Therefore, markup is 10% of cost.
3%
13.2 / 440 = 0.03
0.3*100 = 3%
Answer: 136 m
hope this helped :)