RRB Non Technical Model Papers 9 with solutions

Question : 53 of 100

Marks: +1, -0

The cost price : selling price of an article is a : b, if 'b' is 200% of 'a', then the percentage of profit on cost price is :

Solution:

(1) C.P. : S.P. = a : b

∴{C .P.}/{S. P.}=a/b∴ a =\text"C .P."/\text"S. P."×b

From question,

b = 200% of a =200/100 a = 2a

⇒ b = 2 ×\text"C .P."/\text"S .P."×b

∴S.P. = 2× C.P.
∴ Profit = S.P. – C.P.
= 2× C.P. – C.P.

\text"∴ Profit%" =\text"Profit× 100"/\text"C.P."%

=\text"C.P. ×100"/\text"C.P."% = 100%

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