Lets use options.
Option A:770
Original SP = 770
Original CP = \(\frac{770}{1.1}\) = 700
New CP = 700-10%*700=630
New Profit = 30%*630 = 63*3 = 189
New SP = 189+630 = 819
New SP-Original SP = 819-770 = 49 , matching condition given in question.
Thus answer is Option A
No need to work on remaining options
Option A:770
Original SP = 770
Original CP = \(\frac{770}{1.1}\) = 700
New CP = 700-10%*700=630
New Profit = 30%*630 = 63*3 = 189
New SP = 189+630 = 819
New SP-Original SP = 819-770 = 49 , matching condition given in question.
Thus answer is Option A
No need to work on remaining options
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