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 :)
