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We can assume that discount is on a price of 100
so after first discount of 10% its value will be = 90
now after second consecutive discount of 20% its value will be $$90(1-\frac{20}{100})$$=72
and after third consecutive discount of 30% its value will be $$72(1-\frac{30}{100})$$=50.4
hence it is a equivalent to a single discount of 100-50.4=49.6
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