<human>:  To run his grocery store, Mr. Haj needs $4000 a day. This money is used to pay for orders done, delivery costs and employees' salaries. If he spends 2/5 of the total operation costs on employees' salary and 1/4 of the remaining amount on delivery costs, how much money does he pay for the orders done?
<bot>: How much money does Mr. Haj spend on employees' salary? ** The total amount of money Mr. Haj used to pay for employee salary is 2/5*$4000 = $<<2/5*4000=1600>>1600
How much money does Mr. Haj have left after paying the employees? ** After paying the employee salaries, Mr. Haj remains with $4000-$1600 = $<<4000-1600=2400>>2400
How much money does Mr. Haj spend on delivery costs? ** He also uses 1/4*$2400= $<<2400/4=600>>600 on delivery costs.
How much money does Mr. Haj pay for the orders done? ** The remaining amount of money that he uses to pay for orders is $2400-$600 = $<<2400-600=1800>>1800
#### 1800