A student multiplied a number by 3/5 instead of 5/3 .What is the percentage error in the calculation .

A 60%

B 64%

C 70%

D 74%

Solution

Correct Answer: Option B

ধরি ,সংখ্যাটি =15 (5 ও 3 এর ল সা গু )
অতএব , 15 × (3/5)=9
এবং 15 × (5/3)=25
সুতরাং ভুলের শতকরা হার (25-9)/25× 100%
                                      =16/25 ×100%
                                      =64%

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