Fathers' day suits were advertised for 35% off the regular price. a suit regularly sells for $210. what is the amount of markdown?

The best thing to do here is to first find 10% then multiply is by 3.5
To find 10%, you divide the number that you have (210) by 10.
210/10= 21
This therefore means that 10% is 21.
Now, in order to find what 35% is, you multiply 21 by 3.5
21*3.5= 73.5
this therefore means that markdown on the suit was $73.50
this means that the sale price of the suit would be $136.50
Hope this helps :) 

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