RRB NTPC Mains or Stage 2 Model Paper 5 with solutions

Question : 30 of 120

Marks: +1, -0

A man sold two watches for Rs 1000 each. On one he gains 25% and on the other 20% loss. Find how much % does he gain or lose in the whole transaction?

$100/41 %$ loss
$100/41%$ gain
No gain, no loss
Cannot be determined

Validate

Solution:

(b) When

S_1 = S_2

, thenoverall % gain or % loss

=[100 -{2(100+ x_1 )(100- x_2 ) }/{(100+ x _1)+ (100- x_2 )}%]

=[100 – {2(125)(80) }/{(125)+ (80)}]

[100- {2 ×125 ×80}/205]%

100/41%

= gain (∵ it is +ve)

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