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CBSE Class 7 Answered

Respected sir/mam, I am pretty not clear with this question can you please explain it: "The selling price fo 20 apples is the same as the cost price of 30 apples. Find the gain%."
Asked by ranksahoo | 25 Jan, 2018, 08:13: PM
answered-by-expert Expert Answer
begin mathsize 16px style let space SP space of space 20 space apples space is space straight x space rs
so space CP space of space 30 space appples space is space also space straight x space rs
SP thin space of space one space apple equals space straight x over 20 rs
straight C straight P thin space of space one space apple equals space straight x over 30 rs
profit percent sign equals fraction numerator SP minus CP over denominator CP end fraction cross times 100
equals fraction numerator straight x over 20 minus straight x over 30 over denominator straight x over 30 end fraction cross times 100
equals fraction numerator begin display style fraction numerator 30 straight x minus 20 straight x over denominator 600 end fraction end style over denominator begin display style straight x over 30 end style end fraction cross times 100
equals fraction numerator 10 straight x cross times 30 over denominator 600 cross times straight x end fraction cross times 100
equals 50 percent sign
end style
Answered by Arun | 26 Jan, 2018, 09:15: PM
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