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  1. Successive discounts of 10%, 20% and 30% is equivalent to single discount of?
    1. 60%
    2. 49.6%
    3. 40.5%
    4. 36%
Correct Option: B

Here, r1 = 10 %, r2 = 20% and r3 = 30%
∴ Required discount
= [1 - (1 - r1/100) (1 - r2/100) (1 - r3/100)] x 100%
= [1 - (1 -10/100) (1 - 20/100) (1 - 30/100)] x 100%
= {1 - (9/10) x (4/5) x (7/10)} x 100%
= (1 - 0.504) x 100% = 49.6%


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