Answer:
10 stereos must the salesperson sell to make the same amount of money with both plans.
Step-by-step explanation:
Let the Number of stereo sold = x
According to Plan A
250 + 25X
According to Plan B
50X
According to given condition
250 + 25X = 50X
250 = 50X - 25X
250 = 25X
X = 250/25
X= 10