RRB NTPC Mains or Stage 2 Model Paper 6 with solutions

Question : 35 of 119

Marks: +1, -0

The list price of a watch is ₹ 160. A retailer bought the same watch ₹ 122.40. He got two successive discounts one at 10% and the other at a rate which was not legible. What is the second discount rate?

Validate

Solution:

[1-{d_1}/100][1- {d_2}/100]

⇒122.40 =160 [1 -10 /100][1-{d_2}/100]

⇒

1-{d_2 }/100={122.40× 100} /{160 ×90}×0.85

⇒d_2 = (1- 0.85)×100 = 15%

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