a fruit seller buys apple at the rate of 4 for 10and sale them at the rate of 9 for 21. find his loss and gain percent
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cp of 10 =rupees 4
cp of 1=4/10= 2/5
sp of 21pencil= rupees9
sp of 1 pencil=3/7
profit=3/7-2/5
=1/35
p%=1/35*3/7*¹00
60/49%
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