SOLUTION: A shopkeeper buys 100 pens for Rs 200 and sells 20 of them at a gain of 10%. At what gain percent must he sell the remainder so as to gain 20% in all ?

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Question 817209: A shopkeeper buys 100 pens for Rs 200 and sells 20 of them at a gain of 10%. At what gain percent must he sell the remainder so as to gain 20% in all ?
Found 2 solutions by mathstutor494, richwmiller:
Answer by mathstutor494(120) About Me  (Show Source):
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1.2*200=240
he pays 2 each
he sells 20 for 2.20 each total 44
he has received 44 and needs 240 total
240-44=196
he needs to sell the last 80 for 196
196/80=2.45 he needs to sell last 80 for 2.45 which is 22.5% gain