prices register an increase of 10 on food grains and 15 other..., Percentage, General Mathematics

Question:Prices register an increase  of `10%` on food grains and `15%` on other items of expenditure. If the ratio of an employee's expenditure on food grains and other items be `2 : 5`, by how much should his salary be increased in order that he may maintain the same level of consumption as before, his present salary being `Rs. 2590 ?`

A `Rs. 323.75` 
B `Rs. 350` 
C `Rs. 360.50` 
D None

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+ AnswerD

+ ExplanationLet expenditure on food grains and other items be Rs. 2x and Rs. 5x.

`2x + 5x = 2590`

`or x = 370.`

`:. F = 2 xx 370`

`= 740, 0 = 5 xx 370`

`= 1850.`

New expenditure

`= 110% of 740 + 115% of 1850.`

`= (110/100 xx 740 + 115/100 xx 1850)`

`= Rs. (814 + 2127.50)`

`= Rs. 2941.50.`

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