I have a formula(below) that does a markup for charges. I am using senario manager to add different %increases which works fine., But when I try to decrease a % by using a negative number (-25%) the % is changed correctly but the math part increses the cost rather than decreasing the cost.

IF($D862<=50,($D862*J$2),IF(AND($D862>50,$D862<=15 0),($D862*K$2),IF(AND($D862>=151,$D862<=700),($D86 2*L$2),IF(AND($D862>=701,$D862<=10000),($D862*M$2) ,IF(AND($D862>=1001,$D862<=2000),($D862*N$2),IF(AN D($D862>=2001,$D862<=3000)*($D862*O$2),IF(AND($D86 2>=3001),$D862*P$2)))))))

Can anyone tell me why this is happening? and How to fix this?

Thanks