The price of commodity `x` increases by 40 paise every year, while the price of commodity `y` increases by 15 paise every year. If in 2001, the price of commodity `x` was Rs. 4.20 and that of `y` was Rs. 6.30, in which year commodity `x` will cost 40 paise more than the commodity `y` ?
Suppose commodity `x` will cost 40 paise more than `y` after `z` years. Then,
(4.20 + 0.40 `z`) - (6.30 + 0.15`z`) = 0.40
`hArr` 0.25`z` = 0.40 + 2.10 `hArr` `z` = `2.50/0.25` = `250/25` = 10
`:.` `x` will cost 40 paise more than `y` 10 years afer 2001 i.e., in 2011
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