T

Tina Singh • 11.19K Points
Tutor II Math

Q. Successive discounts of 10%, 20% and 30% is equivalent to single discount of?

  • (A) 60%
  • (B) 49.6%
  • (C) 40.5%
  • (D) 36%
  • Correct Answer - Option(B)
  • Views: 385
  • Filed under category Math
Explanation by: Tina Singh
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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