A student multiplied a number by 4/5 instead of 5/4. what is the percentage error in the calculation
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let the no. be x
then x*(5/4)
by mistake he multiplied it by 4/5.
so,(4x/5)is the mistake done
then error= 5x/4-4x/5
= 25x-16x/20
= 9x/20
error%. =(9x/20/5x/4*100)%
=9x/25x%
hope this is right
then x*(5/4)
by mistake he multiplied it by 4/5.
so,(4x/5)is the mistake done
then error= 5x/4-4x/5
= 25x-16x/20
= 9x/20
error%. =(9x/20/5x/4*100)%
=9x/25x%
hope this is right
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