In her capacity as a prospective trader, Nur Hayati has initiated a long

position by acquiring $10$ contracts. The initial margin needed for each

contract is RM$20,$ while the maintenance margin requirement is RM$7$ per

contract. She makes a deposit of the necessary starting margin on the

specified day of the trade. On the third day, the balance of her margin

account amounts to RM$50.$

Determine the closest variance margin for the $10$ contracts acquired and

provide an explanation.