I also think that the answer to the question posed should by 3050 after manually verifying my results. Enter this where you need the result given that the value entered is in B1.
Formula:
=IF(B1<=25,B1*10,IF(B1<=50,(B1-25)*20+250,IF(B1<=100,(B1-50)*30+750,IF(B1>100,(B1-100)*40+2250))))
The values 250, 750, 2250 are the totals as the range limits are passed. Eg if the value is 30 then the limit for the first range (0-25) has been passed and the value accumulated is 250. To this is added the amount in the next range etc.
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