The injection moulding department of a company uses an average of $38$ litres of a special lubricant a day. The lubricant is replenished when the amount on hand is $195$ litres. It takes three days for an order to be received. The current stockout risk is $9$ percent. What amount of safety stock would be needed if the acceptable risk of stockout is to be reduced to $4$ percent? Refer: z$-$values table. $($Round the final answer to $2$ decimal places.$)$

Safety stock

litres