vinod sold a watch to arun at gain of 12% and arun had to sell it to manoj at loss of 5% if manoj paid 3990 rupees for it how much did vinod pay for the watch
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arun cost price = X × 100-5/100 = 3990
= X × 95/ 100=3990
X × 19/20 = 3990
X × 19 = 3990 ×20
X= 3990 × 20/19
X = 210 × 20
X = 4200
so arun's cp = 4200
now
vinod sold it for 15 % profit
so X × 100+15/100 = 4200
X x 115/100 = 4200
now u can figure out thank you thumbs up pls
= X × 95/ 100=3990
X × 19/20 = 3990
X × 19 = 3990 ×20
X= 3990 × 20/19
X = 210 × 20
X = 4200
so arun's cp = 4200
now
vinod sold it for 15 % profit
so X × 100+15/100 = 4200
X x 115/100 = 4200
now u can figure out thank you thumbs up pls
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