Let the selling price for each of the shopkeeper be Rs 100x
For 1st shopkeeper
SP= Rs 100x
CP=100
CP of 1000gm = Rs. 10
SP of 800gm = Rs. 12
SP of 1000gm =12x1000/800 = Rs. 15
Now take 1000gm as reference to calculate profit.
Profit=SP-CP=15-10=Rs. 5
Profit % = 5x100/10 = 50%
Let the C.P be 'x'
Then, the selling price S.P = x - 16x/100
= 84x/100 = 21x/25
Now, if the S.P is 60 more, then the profit is 14%
=> 21x/25 + 60 = x + 14x/100
=> 114x/100 - 21x/25 = 60
=> (57 - 42)x/50 = 60
=> 15x/50 = 60
x = 3000/15 = 200
Therefore, the Cost price C.P = x = Rs. 200
Profit would be maximum if watches are brought for Rs. 200 and sold for Rs. 425
Profit = Rs. (425 - 200) = Rs. 225
Profit of 9 watches = Rs. 225 x 9 = Rs.2,025.
C.P. of 50 kg rice = Rs. (36 x 20 + 14 x 36) = Rs. (720 + 504) = Rs.1224.
S.P. of 56 kg rice = Rs. (50 x 30) = Rs.1500.
Profit = 1500 - 1224 = Rs.276
Profit % = = = 22.54%.
Let C.P.= Rs. 100.
Then, Profit = Rs.220,
S.P. = Rs.320.
New C.P. = 125% of Rs. 100 = Rs. 125
New S.P. = Rs.320.
Profit = Rs. (320 - 125) = Rs. 195
Required percentage = == 60.9 =~ 61%
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