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Percentage increased $=Initial valueFinal value−Initial value ×100%$

Decrease Percentage: We can find the decrease percentage by calculating the difference between a initial value and the final value, expressed as a percentage of the initial value.

Percentage decreased $=Initial valueInitial value−Final value ×100%$

Given, Total cost $=Rs2775$

$=>x+y=2775$ --- (1)

Also, cost of an article A is $15$ % less than that of article B

=> $x=y−0.15y=>x=0.85y$ --- (2)

From $(1)$ and $(2)$, we get

$0.85y+y=2775$

$1.85y=2775$

$=>y=1500$

And, $x=0.85y=1275$

Hence, cost of A is Rs $1275$ and of B is Rs $1500$

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