90%
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% rate= (108/90) x 100%=120%
Subtracting ten percent from an amount is the same as multiplying the original number by 0.9. In this instance: $120 x 0.9 = $108.
120% is the same as 1.20 and 1.20*90 = 108
The LCM is 1080.
It is: 108/120 times 100/1 = 90%