What do you do to these numbers to get their matching number?

2 --%26gt; 500





3 --%26gt; 750





4 --%26gt; 900





5 --%26gt; 1000





The same thing has to be done to the numbers on the right hand side of the arrow in order to get the other number. I just cannot work it out!!


Thanks.What do you do to these numbers to get their matching number?
If i had one more set i could easily figure it out, but at the present I don't know enough to do anything. if there is another set, please add it.

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