Hello

I'm pretty much a novice at using Excel but made a formula a couple years ago to calculate freight. There are 2 basic scenarios, if the weight falls between a certain brackets it gets a set price or it gets multiplied by a percentage. I think the max number of if than statements is seven... correct? My excel file was corrupted about 3 months back and I have been unsuccessful in recreating it. I'm open to using a more appropriate formula or fixing the current one. Either way I appreciate the help.

=IF(E4<=50,28,IF(E4<=305,42,IF(E4<=393,E4*0.1373,IF(E4<=500,54.05,IF(E4<=712,E4*0.1081,IF(E4<=1000,77))))))

Thanks
Chris