10 % discount and than 20% discount in successive is equivalent to the total discount of
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28%
Step-by-step explanation:
Formula =( x+y -xy/100 )%
=10+20 - 200/100
=30-2
=28
..............................
Traditional method
let amount of item is x=100
10% of 100 =10
price remains after discount is = 90
further 20% discount = 20% of 90 = 18
price remains = 90-18=72
Now the total discount = original - left
=100-72
=28
and 28/100 = 28%
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