RRB RPF RPSF SI and CONS Model Papers 10 with solutions

Question : 67 of 120

Marks: +1, -0

The list price of a clock is Rs. 160. A customer buys it for Rs. 122.40 after two successive discounts. If first discount is 10%, the second is

Solution:

(3) Marked price = Rs. 160
After 10% discount

{S.P}= {90}/{100} × 160={\Rs} .144

Let other discount = x%

∴{(100-x)}/{100} × 144

= 122.40
⇒

100-x= {12240}/{144}

⇒ 100-x=85

⇒ x=100-85=15

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