Example 7. A fruit seller bought some oranges at 5 for a rupee and the
same number at 7 for a rupee. He mixed them and sold at 6 for a rupee. If the total
loses is 34, find how many oranges were bought?
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Answer:
Lets fruit seller brought a lot of 100 oranges
C.P. of 100 orange of 1st kind = Rs.
4
3
×100
= Rs.(0.75×100)=Rs 75
C.P. of 100 orange of 2nd kind = Rs.
5
3
×100
= Rs.(0.60×100)=Rs 60
On mixing, C.P. of 200 oranges = Rs. 75 + Rs 60 = Rs 135 and S.p. of 200 oranges =200×0.90=Rs 180
Profit = 180-135=Rs 45
% of profit=
135
45×100
=33
3
1
%
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