A) 600
B) 900
C) 1200
D) 1376
Correct Answer: B
Solution :
Let x = 1 rupee coin, y = 50 paise coin, z = 25 paise coin \[SP=\frac{5}{10}=\frac{1}{2};CP=?;gain%=20%\] \[gain%=\frac{SP-CP}{CP}\times 100\] \[20=\frac{\frac{1}{2}-CP}{CP}\times 100\] \[=\frac{1}{20}\] ?.(1) Also, let x = 3k, y = 4k, z = 12k \[\therefore \] From (1) \[=\frac{1}{x}\] \[\therefore \] \[\frac{1}{x}+\frac{0.3}{x}=\frac{1}{20}\] \[\Rightarrow \] \[\frac{1.3}{x}=\frac{1}{20}\] \[\Rightarrow \] \[k=\frac{2400}{32}=75\] \[\Rightarrow \] Number of 25-paise coin \[x=26\]You need to login to perform this action.
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