Answer:
25%
Step-by-step explanation:
The formula to compute the equity in the long margin account is
long market value - debt = equity
Also we know that the account will be at maintenance if the equity is 25% of the long market value
Here 25% represents the equity so 75% would be debit
And, the drop in the market value is of
= $90,000 ÷ 0.75
= $120,000
So at this point, the equity is $30,000
Now the margin percentage is
= $30,000 ÷ $120,000
= 25%