whats wrong with the margin?

 

hi

i opened 3000$ account in meta trader 4

and i want to open order with lot size of 1.5

and it tells me not enough mony

and few days ago it let me open in that lot size

and if i open order with 1 lot size i have about 200$ margin why?????

please help

sorry for the bad english

 

call to the company