OT standard is 1.5x on your basic pay.

Aka if your daily pay is RM100, then OT per hour will be 100/8 x 1.5 = 18.75 per hour.

Allowances cannot take in for calculation.

But allowance generally depended on company itself. Some may not have any, some may.

2x.

I suggest your look or buy a book on the Malaysia labour law (which I think can easily find in major bookstores), as it is important as employer to know the labour law scope.

As if >Rm1500 monthly pay, under the labour law, the employee may not fall under or governed entirely by labour law.