SSC CGL Tier-1 03-09-2016 Solved Paper

Single equivalent discount for consecutive discounts of x% and y%
= (x+y−

xy

100

)%
Illustration : Let the marked price of an article be Rs. 100.
Two consecutive discounts = 20% and 10%
Price after a discount of 20% = Rs. 80
Price after a discount of 10% =

80×90

100

= Rs. 72
Discount = Rs. (100 – 72)
= Rs. 28 i.e., 28%
By formula,
Single equivalent discount
= (20+10−

20×10

100

)%
= 28%