Question

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Answer 1

no it is 85

Answer 2

see 4.25 % is for full year
but you go for half a year
\[(4.25 % \div 1year) =(x% \div 1/2year)\]
so x%=2.125%
this 2.125% is per 6 months
now do
4000*2.125%
you'll get 85

Answer 3

\[4.25/1=x/(1/2)\]
so x=2.125