Answer:
$ 28.85
Explanation:
Total amount = (200 × $ 25) + ( 200 × $25 × 0.5) = $ 7500
Maintenance margin = (total amount - ( number of shares × price)) / number of share × price
0.3 = (7500 - 200 p) / 200 p
0.3 × 200 p = 7500 - 200 p
60 p + 200 p = 7500
260 p = 7500
p = $ 28.85