If he took money to do Hajj on behalf of someone, and it was too little or too much, what is the ruling?
Question

                If a man gives another man a specific amount of money to do Hajj on behalf of a deceased person, and the man goes to Hajj but this money is too little or too much, what is the ruling in that case? I also hope you can tell me whether he will have a reward if he does these rituals well on behalf of the deceased.
Praise be to Allah.The Muslims are bound by their conditions, so if the giver and taker agreed that the taker 
    would return any extra money and that the giver would make up any shortfall, then each of them must fulfil his obligations. If there was no such 
    condition then he may take any extra money and he should make up any shortfall himself. But he will have the reward in sha Allah if he takes the 
    money with a sound intention and fulfils the obligation.  
And Allaah is the Source of strength.