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उत्तर :-
माना कि कैलाश की आय Rs. x है|
.°. खर्च = x का 85%
= x × 85/100
= 0.85x
.°. आय मे हुई वृद्धि = 36%
कुल आय = x+x का 36%
= x + x ×36/100
= x + 9x /25
= 34x/25
= 1.36x
खर्च मे हुई वृद्धि = 40%
नया खर्च = 0.85x +0.85 का 40%
= 0.85x + 0.85x ×40/100
= 0.85x+0.34x
= Rs. 1.19x
बचत = आय - व्यय
= Rs. (1.36 -1.19)
= Rs.0.17x
.°. बचत का % = बचत/आय ×100
= 0.17x /1.36x ×100
= 17 /136 ×100
= 1/8 ×100
= 12.5%
.°. कैलाश अपनी आय का 12.5% बचत करता है|
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