A) Rs. 290
B) Rs. 292.5
C) Rs. 292
D) Rs. 294
Correct Answer: B
Solution :
Let the average of all the nine \[=Rs.\,\,x\] . \[\therefore\] \[8\times 30+(x+20)=9x\] \[\Rightarrow\] \[9x-x=240+20\Rightarrow 8x=260\] \[\Rightarrow\] \[x=\frac{260}{8}\] \[\Rightarrow\] \[9x=Rs.\,\,\frac{260\times 9}{8}\] \[=Rs.\,\,\frac{65\times 9}{2}=Rs.\,\,292.5\]You need to login to perform this action.
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