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35% of 1200

10% means nock off a zero so 10% is 120.  Therefore 30% is 3 times bigger so 30% is 360. 

5% is half of 10% so 5% is 60.  

30% add 5% is 35% so 360+60 is 35% which is $420

 

by Level 3 User (4.6k points)

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