Prices register an increase of 10 % on foodgrains and 15% on other items of expenditure . If the ratio of an employee's on foodgrains 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 ?.
Let expenditures on food and other items be Rs. `2x` and Rs. `5x`
Then , `2x + 5x = 2590 or x = 370`
so, expenditure on food = Rs. 2 x 370 = Rs. 740.
Expenditure on other items = Rs. 5 x 370 = Rs. 1850.
New expenditure = 110% of Rs. 740 + 115% of Rs. 1850
= Rs.`(110/100 xx 740 + 115/100 xx 1850)` = Rs. 814 + 2127.50 = Rs. 2941.50
`:.` Desired increase = Rs. 2941.50 - 2590 = Rs. 351.50
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