1.

By selling a radio rs. 903, a shopkeeper gains 5percent .find the cost price of the radio.

Answer»

Let cp = 100

as there is a gain 5% = 100+ 5 = 105.

let cp of the radio = x

now doing as proportion

100/x = 105/903

CROSS MULTIPLICATION

x*105 = 100*903

105x = 90300

x = 90300/105

x = 860 .

hence cost price of the radio = 860.



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